Stability and Change in Fertility Preferences Among Young Women in Malawi
Although studies have demonstrated change in fertility preferences over time, there is a lack of definitive knowledge about the level and direction of change among individuals, especially young and unmarried women. Furthermore, little is known about the factors associated with changes in fertility preferences over time.
The analysis uses the first five waves of data from a longitudinal study of a random sample of women aged 15–25 in southern Malawi. The data were collected four months apart over an 18-month period, between June 2009 and December 2010. Multinomial logit regression models were used to calculate relative risk ratios and identify associations between four categories of life events—reproductive, relationship, health and economic—and shifts in fertility timing preferences.
In each four-month period, more than half of the women reported changes in the desired timing of their next birth, and delays and accelerations in timing desires were common. Several life events, including having a child, entering a serious relationship and changes in household finances were associated with changes in the level and direction of fertility preference.
Shifts in fertility timing preferences often occur in response to changes in life circumstances. Understanding the reasons for these shifts may aid family planning providers in meeting women’s contraceptive needs.
International Perspectives on Sexual and Reproductive Health, 2012, 38(1):34–42, doi: 10.1363/3803412
Fertility preferences are important measures for forecasting fertility, calculating levels of unwanted or mistimed fertility and assessing unmet need for contraceptives. One of the assumptions underlying the use of fertility preferences for these objectives is that they are relatively stable over time.1 However, in Sub-Saharan Africa—where fertility, both desired and actual, remains comparatively high and childbearing patterns are increasingly heterogeneous—fertility preferences are likely to be unstable.* Very little research has focused on how individuals’ fertility timing desires change over time; however, there is evidence that other fertility preferences respond to changes in life circumstances.2,3 Indeed, researchers in the region have argued that even individuals who are committed to a particular family size may temporarily alter their fertility preferences in response to changes in economic or reproductive circumstances.2,3 In studies from Africa, fertility preferences reported in surveys are often tentative and malleable.2-6 Such flexibility may allow for change in fertility preferences, even over short time periods. Understanding how fertility timing preferences change over time is particularly useful, because the timing of births is likely to influence ultimate family size, perhaps even more so than individuals’ ideal number of children.
In fertility transition research, which has traditionally focused on aggregate measures of fertility preferences and their predictors, structural changes, such as economic development and societal improvements in education and health, are associated with changes in country-level fertility preferences.7-12 However, fertility preferences are characteristics of individuals and couples, not countries. Rarely have studies, particularly in Sub-Saharan Africa, examined how changes in life circumstances relate to an individual’s fertility preferences.
The present study uses five waves of longitudinal data collected in rural Malawi in 2009–2010 to examine the stability of women’s fertility preferences over time and the life events that are associated with delays or accelerations in the desired timing of the next birth.
Charting Preferences over Time
Fertility is highly valued in Sub-Saharan Africa, and the desire to stop childbearing is rare among younger women. Still, a woman may be reasonably certain that she wants to have another child, but she may be less sure about when she wants to have a child; equally, she may be more focused on whether now is the right time to have a child with a particular partner than on precisely how many children she plans to have over her lifetime.2 This suggests that women’s fertility preferences may change over short time periods, which may be particularly true for young or lower-parity women, as they may experience more economic uncertainty and relationship instability.3,13–16
Studies in Africa have documented considerable change in individuals’ fertility preferences over time.17-20 In two studies, one from Morocco and the other from Ghana, approximately two-thirds of women changed their family size preferences over two and three years, respectively.21,22 In another study from Ghana that used multiple waves of closely spaced data (approximately nine months apart), women changed their preference for wanting a child or for the desired timing of the next birth in more than one-third of the survey waves.23
Fertility preferences are related to several factors, including age, education, and marital and socioeconomic status. As life circumstances evolve, so too may fertility preferences. In Sub-Saharan Africa, women may alter their preferences because of relationship changes and the influence of their partner’s preferences;21,24 child mortality;21,25 pregnancy or pregnancy complications;23 and changes in economic circumstances, employment or health.21,23,26
Most of the studies that have investigated change in fertility preferences over time both in Africa and in the West have used data points spaced at least one year apart, although many have used considerably longer periods.21,25,27,28 Multiple changes in preferences may occur over the years and are likely to be missed when there are long gaps between surveys, potentially leading researchers to overestimate the stability of preferences. In addition, long periods between surveys make it possible for a variety of changes to take place in respondents’ lives, complicating efforts to isolate characteristics or events that could be associated with change. Shorter reference periods make it easier for researchers to measure changes in fertility preferences as they occur in tandem with other life events. Furthermore, shorter reference periods are particularly useful for capturing fluctuations in short-term fertility prefer- ences, such as the desired timing of the next birth, which may be more sensitive to changing life circumstances.
The objective of this study is to examine the stability of and identify the factors associated with fertility timing preferences in a sample of young Malawian women. Our analysis first describes how the desired timing of the next birth changes across five closely spaced waves of data over 18 months. Next, we investigate how changes in relationships, reproductive experiences, health and economic circumstances relate to changes in the desired timing of the next birth.
At six children per woman, Malawi’s total fertility rate remains comparatively high.29 Average fertility varies by women’s residence, education and other background characteristics, with education and wealth inversely related to fertility.29 Women living in rural areas have higher fertility than women in urban areas (6.4 vs. 4.2 births per woman, respectively). Nationally, the mean ideal family size among women aged 15–49 is 4.1. The fertility rate peaks between the ages of 20 and 24 for Malawian women, and the median age at first birth is 19, a statistic that has remained relatively stable over time.29
As elsewhere in eastern Africa, HIV prevalence is high in Malawi—approximately 11% of Malawian adults are estimated to be HIV-positive.30 Knowing or suspecting that one is HIV-positive is associated with changes in fertility preferences in this context.31,32
Data for this study come from the first five waves of Tsogolo la Thanzi,† an ongoing longitudinal study of young women and their partners in southern Malawi. The survey waves are four months apart, and the data used here were collected between June 2009 and December 2010. The Tsogolo la Thanzi sample was drawn from a complete household listing in April 2009 of all individuals who lived within seven kilometers of Balaka, a town approximately 90 kilometers from the southern city of Blantyre. The sampling frame for Tsogolo la Thanzi included not only household members, but also people living in boarding schools and rest houses (motels used as residences, often for sex workers) within the catchment area. The Tsogolo la Thanzi sample was selected using a random number generator from the complete list of men and women aged 15–25. Ninety-six percent of eligible women were interviewed at baseline (Wave 1), and approximately 85% of these respondents were reinterviewed at Wave 5. Highly trained Malawian interviewers conducted interviews in Chichewa in private rooms at the Tsogolo la Thanzi research center. The current analysis is limited to the female Tsogolo la Thanzi sample.
Unit of Analysis
The unit of analysis for the study is a segment, defined as the period of time between two successive interviews. Women were not necessarily interviewed at every wave—some left the study and reentered at later waves. Thus, a woman who was interviewed at Wave 1, missed Wave 2, reentered the study at Wave 3, and was interviewed then and at Wave 4 would have contributed two segments: one between Waves 1 and 3 and one between Waves 3 and 4. The multivariate models contain 4,608 segments that measured change in fertility timing preferences. The vast majority of segments are one wave long; the majority of respondents contributed all four possible segments (82%).
The dependent variable for our analysis is the desired timing of the next birth. At each interview, respondents were asked how long they would like to wait before having their next child. Responses included: as soon as possible; less than two years; two to three years; three to four years; four to five years; five or more years; and don’t want a(nother) child. Four percent (67) of respondents gave a nonnumeric response ("don’t know" or "whenever/no preference") at a minimum of one wave and were excluded from the analytic sample. We grouped respondents who reported that they wanted a child as soon as possible with those who reported wanting a child in less than two years, because both categories reflect a desire for pregnancy in the near term. A change in the desired timing of the next birth was measured at each wave and coded as no change (reference category), a desire to delay or to accelerate the timing of the next birth.
The key independent variables in the explanatory models are life events that had occurred since a respondent’s last interview. We measured the four categories of life events—reproductive, relationship, health and economic—at each wave after the first interview. We included only life events that were experienced by at least 5% of the sample between their first and second interviews.‡ All items were coded dichotomously.
•Reproductive events. Women who experience a pregnancy or birth are likely to change the desired timing of their next birth and may also reconsider their overall family size goals, in response to unanticipated life changes associated with the pregnancy or birth.26 Tsogolo la Thanzi data include current pregnancy status and a biomarker for pregnancy at each interview. A woman was considered to have had a new pregnancy between interviews if she reported one since the previous interview, or if she had not reported a pregnancy at the previous interview but subsequently had tested positive for pregnancy (i.e., a likely unknown pregnancy). Because a new pregnancy is highly likely to alter the desired timing of the next birth, all models of timing apart from the baseline model include a control for new pregnancy. Respondents were considered to have had a new birth if they reported having had a child between interviews.
•Relationship events. Both beginning a new relationship and exiting a relationship might influence fertility preferences. Respondents were considered to have gained a partner if they had married or become seriously involved with a nonmarital partner. They were considered to have lost a partner if they had divorced, become widowed, or separated from a spouse or serious nonmarital partner. We accounted for the possibility that a woman might have both gained and lost a partner between interviews. Women were also asked whether they had heard rumors that their partner was unfaithful since the last interview. This question was designed to capture doubts about a partner’s fidelity. (Infidelity is a common cause of divorce in Malawi.33) This variable was intended to measure relationship instability that might be related to a change in fertility preferences.
•Health events. Dramatic changes in health may influence fertility preferences. In Malawi, where HIV prevalence is high, changes in the health of a woman or her partner may suggest an HIV infection, prompting a revision of fertility preferences. Several studies have documented this tendency—to alter fertility preferences whether HIV is actually diagnosed or only suspected because of a downturn in health—in African countries such as Malawi,31,32 Zimbabwe34 and Tanzania,35 where HIV is common. Of course, health changes unrelated to HIV also might be associated with shifting preferences. For example, stints of poor health—whether related to a reproductive event4,5 or to an illness—may encourage a woman to delay her next pregnancy until she feels well enough to carry it to term. Health events measured in this study include experiencing a decline in health, losing weight (a symptom of HIV infection),36 or having a spouse or partner who has become ill.
•Economic events. Events that change one’s economic circumstances might alter plans for future childbearing. For example, losing a job could prompt postponement of pregnancy to allow time for a household to recover financially before adding another member. Conversely, a spouse beginning a new job could accelerate a woman’s childbearing plans. Frequent changes in fertility preferences may also reflect the economic uncertainty that is common in developing societies2,3,6 such as Malawi, where employment may be sporadic or scarce. To measure economic change, our models include whether a respondent had moved to a better house, her spouse or partner had gotten a good or better job, or her household had experienced a food shortage since the last interview.
Baseline Controls: Social and Demographic Variables
Several social and demographic variables, measured at baseline and associated with fertility preferences, are included as controls in all multivariate models. We use a three-category variable for relationship status: single (reference category), married and serious nonmarital partnership. Education is categorized as no education (reference category), primary, some secondary education or completed secondary schooling. Age is coded continuously, and we include a quadratic age or "age-squared" term, to account for nonlinear age effects. Socioeconomic status is captured through an index of household goods. Respondents were asked to identify which of the following nine working items they owned: bed with mattress, television, radio, landline or mobile phone, refrigerator, bicycle, motorcycle, animal-drawn cart and car or truck. The index is created by summing the total number of items reported by each respondent. We include a variable for the number of living children. Fewer than 1% of the sample had more than three children, so we combine those women into one category.
All female respondents who were not knowingly pregnant at baseline and participated in at least one additional interview qualified for inclusion in the analytic sample. Fewer than 1% of respondents were not interviewed at Wave 1 and instead completed a baseline interview at Wave 2. Respondents were excluded if they were missing data on the desired timing of their next birth at any wave at which they were interviewed (2); answered "don’t know" (14); or stated "no preference/whenever" (45). Excluded respondents, compared with those in the analytic sample, were, on average, one year older; they had, on average, one year less of education and one less working household good on the socioeconomic index; and they were less likely to be single. The final sample contained 1,254 Malawian women who were aged 15–25 at the baseline interview (83% of the female respondents who completed a baseline interview).
We begin by describing the extent of change in fertility timing preferences across four, four-month segments. Next, we use multivariate models to examine associations between selected characteristics and life events, and change in timing preferences. We use multinomial logit regression analyses, calculating relative risk ratios to separately compare the likelihood of changes (accelerations and delays) in the desired timing of next birth with the likelihood of no change. We control for the baseline fertility timing preference in all models. Because some women reported in nonconsecutive waves, segments may be different lengths; therefore, we include an indicator in each model to account for the length of each segment. In each model, we also include an indicator of the wave in which the segment ends to account for respondents having been interviewed over multiple waves and for potential seasonal variation.
At the baseline interview, the mean age of the respondents was 19.4 years (Table 1). More than half (56%) of the respondents were either married or in a serious nonmarital relationship. The majority had some education (98%), and more than half (55%) had at least some secondary schooling. The women in this sample had relatively few children: half (51%) had none and one-quarter had just one child. Comparatively few women wanted to have a child within two years (14%); the majority reported wanting to wait two or more years (78%), including 32% who wanted to wait five or more years. Seven percent of the sample reported wanting no more children.
Most life events were experienced by fewer than 10% of the women at each segment (Table 2, page 37). The most commonly experienced events were gaining a partner (9–11%), moving to a better house (8–13%) and experiencing a food shortage (10–20%). The frequency with which both positive (better house) and negative (food shortage) economic events were reported over such short periods of time illustrates the somewhat rapid economic change and high level of economic uncertainty that individuals in Malawi experience.
Change in Fertility Preferences
More than half of the women changed their fertility timing preference over each segment (Table 3, page 37). A majority of the respondents (83%) reported at least one change in timing preference over the course of the study (not shown). Although we would expect some movement in timing preference during the course of a year and a half, this high level of change suggests that fertility timing preferences may be particularly responsive to everyday events. Directionally, there is no clear pattern—the proportions of changes that represent delays and accelerations in the desired timing of the next birth vary by segment.
Life Events Associated with Changes in Timing Preferences
Age, socioeconomic status, baseline timing preference and number of living children were associated with shifts in timing preferences (Table 4. Women whose age fell in the middle of the sample’s age range—around age 20—were more likely than younger and older women to report changes (both delays and accelerations) in timing preferences (not shown). Women from higher socioeconomic status households had more stable timing preferences than poorer women. Women with a higher baseline timing preference were less likely to desire to delay and more likely to desire to accelerate their next birth, suggesting some regression toward the mean. However, women with more children were more likely to desire to delay the timing of their next birth. This finding is largely explained by these women deciding not to have any more children (not shown).
A new pregnancy was positively associated with a desire to postpone the next birth. A new birth, however, was not associated with changes in fertility timing preferences. When relationship events were considered, gaining a partner was associated with a desire to accelerate the timing of the next birth. None of the health events included in the analyses was related to changes in the desired timing of the next birth. Several of the economic events were associated with changes in timing preferences. A better house was associated with a preference to accelerate the timing of the next birth; a spouse or partner gaining a good or better job was positively associated with changes in both directions (accelerations and delays); and experiencing a food shortage was associated with a desire to accelerate the next birth. The inclusion of these economic life events rendered the relationship between baseline socioeconomic status and the likelihood of accelerating the next birth insignificant. Finally, after controlling for all types of events, none of the associations disappeared, and all retained their direction.
Our results show considerable change in fertility timing preferences in a sample of young Malawian women interviewed up to five times over an 18-month period. During each segment, more than half of the respondents changed timing preferences; and more than 80% of respondents reported at least one change over the full 18 months.
We found several significant relationships between events in the women’s lives and changes in their fertility timing preferences. Unsurprisingly, a new pregnancy was the life event most strongly associated with a change in timing preference: a desired postponement of the next birth. Women’s fertility timing preferences have been found to be strong predictors of whether or when they become pregnant in the future.37 A change in fertility timing preference in response to a new pregnancy may therefore represent the successful fulfillment of a previously stated timing preference, especially if a woman reported wanting a child as soon as possible. Upon further investigation, two-thirds of the women who experienced a new pregnancy reported at their next interview that they would like to have their next child later than they had previously stated (not shown). Nonetheless, one-third of women who experienced a new pregnancy either reported no change in their fertility timing preference or said that they would like to have their next child sooner than they had previously stated (not shown). Women may revise timing preferences at the advent of an unexpected pregnancy and desire to have another child sooner because normative birth spacing in Malawi is two to three years.38 Thus, despite her previous desire to postpone childbearing, once a woman has started bearing children she may prefer to have them in relatively close succession.
Regarding relationship events, the only variable that was associated with changes in timing preferences was gaining a partner, which was linked to a desire to accelerate the pace of childbearing. This association is likely related to the social norm in Malawi that couples have a child within the first year of marriage. In a society with comparatively little nonmarital fertility,39 these findings likely reflect most young women’s experiences.
We found a number of relationships—some surprising—between changes in economic circumstances and fertility timing preferences. Women who had moved into a better house were more likely to report a desire to accelerate the timing of their next birth. This finding remained significant even after controlling for a new relationship, including marriage. We interpret moving to a better house as an act of settling down and a marker of improved economic conditions that may motivate a woman or couple to want to have a child. We also found that a spouse or partner having acquired a good or better job was associated with changes in timing preferences in both directions. At first glance, this result was confusing: We had expected improved economic circumstances to be associated only with a desire to accelerate the next birth. However, in Malawi, where migration is common, getting a new job may require a partner to move, which might delay subsequent childbearing. Because of the relationship between a spouse’s or partner’s employment and changes in fertility timing preferences, we also considered whether a woman’s work would affect her desired timing for the next birth. Yet, at each segment (the cutoff for inclusion in the study), fewer than 5% of women had gained a good or better job, and we did not find a significant relationship between this event and changes in timing preferences (not shown).
Finally, we found a positive association between having experienced a food shortage and wanting to have the next child sooner. A food shortage was one of the most common life events in all segments, affecting one-third (31%) of women at some point during the 18-month study period (not shown). A food shortage might indicate a worsening economic situation for a household, which may then motivate a woman to have a child sooner, before the situation deteriorated further. Additionally, there may be a link between hunger and sex for young women in this context. Research from Brazil40 has demonstrated that in times of hunger, sex may serve both practical and pleasurable functions. Sex may lead to an increase in resources for women through a relationship with a man or the birth of a child; it also may provide compensatory gratification (i.e., pleasure to make up for the loss they experience during a food shortage). The potential of a birth to strengthen social and economic support for young women also has been documented in South Africa.41
This study has a number of limitations. First, the Tsogolo la Thanzi sample comprises young women early in their reproductive years—a group that may have been particularly likely to experience changes in fertility timing preferences. Therefore, the extent of change observed here may have been higher than that among older, married or higher parity women. Second, although shorter intervals are useful for producing estimates that better approximate the true level of change, they may not capture the longer-term effects of some life events. Finally, the extent to which many of the short-term changes in fertility preferences identified here resulted from measurement error or unpredictable fluctuation, rather than real change, is unclear. The finding of some regression toward the mean suggests that some correction did occur.
Our results suggest that fluctuations in fertility preferences are often in response to changes in life circumstances, but not always in easily predictable ways. This lends support to the sequential model of fertility decision-making,26 and builds on the qualitative findings of Agadjanian,3 Johnson-Hanks2 and others. Future research that uses a wider selection of variables as well as qualitative data may capture different types of life events and individual-level mechanisms that are linked to changes in fertility timing preference.
Our findings are relevant to family planning experts and providers who are interested in gauging when (and how) young women’s fertility preferences may change. When a woman’s fertility preferences shift, her needs for contraceptive services and methods also may change. By demonstrating the frequency with which young women’s fertility timing preferences might change, even over a relatively short period of time, and the characteristics and noteworthy life events that might be associated with those changes, our findings may help health care providers meet young women’s evolving reproductive needs so that they can achieve their reproductive goals.
Several areas would benefit from further research. Although scholars are investigating ways in which HIV may affect fertility preferences and behaviors,31,42–44 we still know little about how non-HIV-related health changes affect fertility desires. Our study found that women’s fertility timing preferences were sensitive to economic changes but that some of the relationships did not lend themselves to easy interpretation. Given the considerable demographic literature and interest in the relationship between economic development and fertility change, more research is needed to understand how economics and fertility are related at the individual level. Finally, fertility decisions are not made in a vacuum. Future research should investigate the potential influence of partners and family on young women’s fertility preference formation and change.
*The existence of heterogeneous childbearing patterns in the midst of high fertility suggests that social norms regarding fertility are in flux. Thus, women in such a context may have more flexibility in terms of the desired number or timing of future children. Additionally, women may face fewer negative social sanctions for varying their childbearing preferences (or patterns) than might be the case where fertility rates are low or where most women follow the same childbearing path.
†Tsogolo la Thanzi is a research project designed by Jenny Trinitapoli and Sara Yeatman. See http://projects.pop.psu.edu/tlt for more information.
‡Fewer than 5% of the sample had a new birth during the first two segments because the sample was restricted to women not knowingly pregnant at their baseline interview.
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Christie Sennott is a doctoral candidate in sociology at the University of Colorado, Boulder, USA, and Sara Yeatman is assistant professor in the Department of Health and Behavioral Sciences at the University of Colorado, Denver.
The authors are grateful to the National Institute of Child Health and Human Development, which funded the Tsogolo la Thanzi research project and provided some salary support for the authors through NICHD R01-HD058366.