Decent employment and safe working conditions are foundational to health [24], and also central to SDG 8. SDG 8.5 calls for “achiev[ing] full and productive employment and decent work for all women and men,” while SDG 8.8 outlines states’ responsibility to “[p]rotect labour rights and promote safe and secure working environments for all workers,” including those in precarious employment [3].
Consistent employment with an adequate wage often provides the most sustainable pathway out of poverty, and enables families to better meet their basic needs. Maternal employment in particular has intergenerational benefits for health and well-being; when women have their own earnings and assets, investments in children’s health and education increase [25, 26]. SDG targets 1.1 and 1.2 call for eradicating extreme poverty and otherwise reducing the share of people in poverty by half, while SDGs 5.1, 5.7, 5.9, and 10.2 all support strengthening women’s access to employment and economic opportunities [3].
In a range of studies, paid leave has been associated with increases in both women’s earnings and their long-term attachment to the labor force [5, 27,28,29]. For example, Waldfogel (1998) found that the availability of maternity leave was associated with increases in wages for up to 5 years among mothers who returned to work at some point after childbirth in Britain and the USA, while Rasmussen (2010) found that introducing 6 weeks of paid parental leave in Denmark, which supplemented the 14 weeks of post-birth leave already available to mothers, had small positive effects on mothers’ earnings, work experience, and employment rates in the 5 years after the reform [27, 28]. Similarly, two studies from California, both using a difference-in-differences approach, found that the state’s paid family leave policy increased working mothers’ take-up of leave, and was associated with increases in the work hours and wages of mothers with young children [30, 31]. Over time, ensuring broad and inclusive participation in the workforce supports economic growth and higher GDPs, which is the aim of SDG 8.1 [3]. For example, in a 2012 study, researchers found that eliminating the gender gap in labor force participation in OECD countries could result in a 12% increase in GDP across the OECD as a whole by 2030 [32]. In the USA, the only OECD member that lacks paid maternal leave, economists have estimated that the lack of “family friendly” policies is responsible for nearly a third of the relative decline in female labor force participation in the USA compared to other OECD countries between 1990 and 2010 [33]. These findings suggest that the provision of leave may have significant benefits for the economy that should be considered alongside any assessment of its costs.
However, one important question is what the ideal duration of paid leave is to support women’s economic outcomes. The International Labor Organization (ILO) Maternity Protection Convention (2000) established a minimum global standard of 14 weeks of paid maternal leave for working mothers [34]. In its supplemental Maternity Protection Recommendation, the ILO recommended a minimum of 18 weeks [35]. Notably, both of these fall short of the 26 weeks that would fully support the 6 months of exclusive breastfeeding recommended by WHO. As of 2014, 53% of countries met the ILO Convention standard, including 47% of low-income countries, 43% of middle-income countries, and 77% of high-income countries, showing that it is feasible for countries across economic levels to provide paid leave [36,37,38,39]. Twenty-six percent of countries, including 6% of low-income countries, 19% of middle-income countries, and 52% of high-income countries, provide at least 26 weeks, facilitating mothers’ ability to meet the WHO breastfeeding guidelines [36]. Finally, 17% of countries, including 3% of low-income countries, 15% of middle-income countries, and 30% of high-income countries, provide a year of paid leave or more [36]. In addition, 86% of countries provide a maximum wage replacement rate of at least two-thirds regular wages, as recommended by the ILO, which is another important factor in determining whether women can afford to take leave and how leave will shape economic outcomes [36].
A study of 21 high-income countries, using multilevel models to estimate women’s earnings as a share of their family’s income, found that access to more than 24 weeks of paid leave increased women’s long-term relative contribution to household income [40]. Yet other research has found that longer leaves, such as those lasting more than 9 months or more than 1 year, may have negative effects on women’s earnings, though approaches to measuring these effects have varied across studies [41,42,43,44]. For example, Schönberg and Ludsteck (2014) compared earnings of mothers who took leave 3 months before a series of increases in leave duration in Germany with earnings of mothers who took leave 3 months after [44]. Following a reform that increased maternal leave from 6 to 22 months, up to 4% of mothers decided not to return to work, while mothers’ labor market income fell by approximately 8% 6 years after birth, and employed mothers’ earnings fell by approximately 3% for 2 to 6 years after birth [44].
Further understanding the mechanisms and tipping points for this variation in outcomes for longer leaves will be important for determining the optimal length of leave to support women’s earnings and employment.
In addition, if paid leave is only available to women, it may lead to greater gender discrimination in the labor market. This discrimination could in turn widen the existing gender gaps in wages and employment, partially offsetting some of the benefits of paid leave to women’s earnings. The following section examines the evidence for providing adequate leave to both parents in more detail.
Gender equality
Gender inequality has deep impacts on health, whether through shaping the allocation of wealth and resources, determining whose health needs are recognized and prioritized, or directly affecting physical and mental health as a result of increased exposure to violence and discrimination. Gender inequality also has repercussions specifically for maternal and child health, and gender bias has been identified as a contributor to inadequate access to prenatal care and nutrition during pregnancy, lower birth weights, higher rates of maternal mortality, and undernourishment of female children [45, 46]. While the consequences of gender inequality and traditional gender norms primarily disadvantage women, men also feel the effects, which manifest in fewer opportunities to participate in caregiving, increased risk-taking, and shorter life expectancies [47]. Against this backdrop, SDG 5.4 calls on countries to promote “shared responsibility within the household and the family” [3].
Research suggests that the structure of labor policies like paid leave has significant implications for gender equality, making these policies a potentially important lever for accelerating progress toward all of SDG 5’s targets, as well as SDGs 10.2, 10.3, and 10.4 [3]. For example, a wide range of studies have found that fathers who take paid leave are more involved in childcare both during the leave period and later in the child’s life [48,49,50]. This evidence supports the idea that when available to both parents, paid parental leave can support gender equality at home and at work. By contrast, when paid leave is available only to women, it may reinforce the idea that women are primarily responsible for caregiving, while men are the primary earners. Currently, while all but eight countries globally provide paid leave to women, only 49% make any leave available to fathers [36] (Fig. 1). At the same time, leave for fathers tends to be for a far shorter duration; 49% of countries that make leave available to fathers provide less than 3 weeks [36].
Further, studies have shown that simply making parental leave available to men is often insufficient to increase men’s take-up. This is partly due to stigma and longstanding gender norms [51, 52], though it may also result as a consequence of the gender wage gap. If paid leave is only provided at partial wages, it makes sense for the lower-earning parent, who remains more likely in most countries to be the mother, to take a greater share of the available leave [53]. Based on data from a wide range of high-income countries from 2000 to 2013 [54], a wage replacement rate of at least two-thirds appears to be the minimum for even modest take-up by fathers, while a rate of 80–100% of regular wages is needed for broader participation. Still, even in the face of the gender imbalance in take-up, it is important to note there is substantial data that wage replacement rates also influence whether and for how long women take leave. In the USA, which only provides unpaid leave, women are nearly twice as likely as men to report that they needed leave but were unable to take it, while nearly half of those with unmet need for leave cite lack of affordability as the key reason [55]. Likewise, in states that provide paid leave, including Rhode Island and California, leave uptake was limited for both women and men due to the low wage replacement rates, which provide a maximum of 60 and 55% of wages, respectively [56, 57].
In addition to ensuring wage replacement rates are high enough for families to be able to afford for both parents to take leave, two policy approaches, “use-it-or-lose-it” and “bonus” leave, have been effective in encouraging men to take leave. Research across the OECD has shown that reserving leave for fathers through “use-it-or-lose-it” schemes has markedly increased the share of fathers taking leave [58,59,60]. For example, in Korea, three times as many men took leave following the introduction of 1 year of non-transferable parental leave as an individual entitlement for each employee in 2007 [61]. These policies may also reduce stigma for leave-taking, which is sometimes seen as a signal of low commitment at work. Similarly, economic incentives or bonuses that are only available if both parents take leave have been used to increase fathers’ leave taking [53, 54]. As of 2014, however, only 15 countries reserve more than 2 weeks of leave for fathers or provide incentives for fathers to take leave [36] (Fig. 2). More research is needed in low- and middle-income countries to assess which policies would best support an increasingly equal role by fathers.
Maternal health and wellbeing
While the research is derived primarily from higher-income countries, a range of studies have found important health benefits for women who have access to paid parental leave.
Most fundamentally, paid leave enables women to physically recover from childbirth before returning to work [62, 63]. In addition, some research suggests that paid parental leave also has benefits for mothers’ mental and emotional health, a priority under SDG target 3.4 [3]. For example, several studies have found that the availability of leave reduces the risk of postpartum depression [64, 65] while Avendano et al. [66], using a difference-in-differences approach, found that more generous maternity leave policies are associated with lower rates of maternal depression in older age. However, across both physical and mental health, length of leave may make a critical difference. According to two studies, it is after 12 weeks of post-partum leave that mothers’ self-reported measures of vitality and physical health typically begin to improve [62, 63].
Beyond these broad effects on recovery, paid postpartum leave’s facilitation of breastfeeding has specific maternal health benefits as well as benefits for the health of their infants. For example, Geller et al. [67] found that breastfeeding may reduce the risk of post-partum hemorrhage—a leading cause of maternal mortality, particularly in LMICs; SDG 3.1 calls for further reducing the global maternal mortality ratio to below 70 per 100,000 live births [3]. Likewise, Ip et al. [68], in a study of high-income countries, found that breastfeeding reduces the risk of premenopausal breast cancer and may also lower the risk of ovarian cancer.
Finally, at least one study has found an association between paid parental leave and reduced intimate partner violence [69], a critical issue highlighted in SDG 5.2 [3].
In sum, although further research is needed to confirm the effects of paid leave on maternal health, including what balance of antenatal and postpartum leave is optimal for supporting mothers’ health outcomes, existing studies suggest that it could have positive effects on recovery from childbirth and overall well-being.
Paternal health and wellbeing
While a growing body of evidence suggests that paid leave can support women’s health, the potential benefits for men are less well studied.
Although few studies have examined this question directly, several have found that the availability of paid leave for fathers increases their involvement with their infants, which may result in greater satisfaction in their relationships with their children [48, 50]. For example, in an earlier review of the literature, primarily from the Nordic countries, O’Brien (2009) found that paid paternal leave “has the potential to boost fathers’ practical and emotional investment in infant care,” but called for greater research to understand the underlying mechanisms [50]. In a more recent study from Bangladesh, which does not currently have paid paternal leave, researchers found that fathers who arranged to take time off around the birth of a child were more involved with their children and spent more one-on-one time with them [70].
Breastfeeding breaks
As previously noted, breastfeeding is widely considered to be a highly impactful infant health intervention. A child who is exclusively breastfed is 14 times less likely to die within the first 6 months than a child who is not breastfed, due in part to dramatic reductions in malnutrition [71, 72] and simultaneously to reductions in infections. Breastfeeding has also been associated with improved health outcomes in childhood, including improvements in neurocognitive development and lower rates of chronic diseases like diabetes (SDG 3.4) [3, 21, 73, 74]. The World Health Organization recommends 6 months of exclusive breastfeeding for infants to receive the maximum health benefits.
For mothers who want or need to return to work within this time period, paid breastfeeding breaks can facilitate the continuation of exclusive breastfeeding for the full 6 months [75]. In this way, breastfeeding breaks can serve as an important complementary policy to paid parental leave [76]. Further, while countries at all income levels have managed to afford at least some amount of paid leave, breastfeeding breaks are a less expensive policy option that can supplement shorter leave periods in some of the lower-resource countries that cannot yet afford to provide leave of longer duration.
Relatively few studies have examined the specific impacts on health of breastfeeding breaks, though the existing research suggests a positive relationship between supportive breastfeeding policies and breastfeeding rates. For example, one study from the USA found that states that had enacted breastfeeding legislation reported higher rates of exclusive breastfeeding than those without legislation [77].
Further research suggests these effects may extend more broadly. In a cross-sectional study of 182 countries’ breastfeeding break policies, Heymann et al. [78] found that the guarantee of paid breastfeeding breaks until the infant is at least 6 months of age was associated with rates of exclusive breastfeeding that were 8.9 percentage points higher for infants under 6 months of age. Like paid leave, by successfully facilitating breastfeeding, legislated paid breaks are likely to have benefits for both infant and maternal health, making breastfeeding breaks another important policy area for consideration in efforts to advance the SDGs and maternal and child health more generally. As of 2014, 71% of countries guaranteed paid breastfeeding breaks until the infant was at least 6 months old, including 69% of low-income countries, 73% of middle-income countries, and 70% of high-income countries [36] (Fig. 3). More broadly, examining other labor policies that support breastfeeding, including policies around a physical space to breastfeed or pump, storage for breastmilk, and nearby infant care, would provide a more comprehensive understanding of countries’ efforts to facilitate exclusive breastfeeding by working mothers.
Paid leave for family health needs
Caregiving needs and responsibilities extend beyond infancy. As a result, many workers have to take time off from work to care for the acute or chronic health needs of children or adult family members.
As with breastfeeding breaks, few studies have examined the specific impacts of paid leave for other family health needs. However, Earle and Heymann (2012), in interviews in the USA, found that workers who have a child with a health problem are 30% less likely to lose wages if they have access to paid leave for family health needs [79]. The study also found that female employees were 69% more likely to report losing income or wages due to caregiving, further suggesting that paid leave for all types of caregiving needs is important for both health and for gender equality. In addition, prior research has found that children recover from illness and injury faster when their parents are able to provide care [80,81,82], and that parents’ presence reduces emotional distress among ill children [83,84,85,86].
As of 2014, 45% of countries provide some form of paid leave that parents can take to meet the health needs of their children beyond infancy, while 10% provide unpaid leave for these purposes [36]. In 3% of countries, leave to care for children beyond infancy is only available to mothers [36] (Fig. 4).
Thirty-six percent of countries provide some form of paid leave that can be used to provide care to adult family members, while 13% provide unpaid leave for these purposes [36] (Fig. 5).