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It is inconclusive nowadays for the association between infant’s gender and their mothers’ risk of developing postpartum depression (PPD). In addition, a complete overview is missing. A meta-analysis of cohort and case-control studies was performed to address the question of whether women who gave birth to a female infant were at an increased risk of developing PPD, compared with those giving birth to a male infant. Unrestricted searches were conducted, with an end date parameter of 31 January 2018, of PubMed, Embase, Google Scholar, Cochrane Libraries, and Chinese databases, to identify studies that met pre-stated inclusion criteria. Reference lists of retrieved articles were also reviewed. Either a fixed- or a random-effects model was used to calculate the overall combined risk estimates. Twenty-three studies involving 119,736 women were included for analysis. Overall, mothers who gave birth to a female infant experienced a significantly increased risk of developing PPD compared with the reference group (OR = 1.15, 95%CI: 1.01–1.31;  p  = .03). However, substantial heterogeneity ( p  &lt; .00001;  I2  = 75%) was observed across studies. Relevant heterogeneity moderators have been identified by subgroup analysis. Sensitivity analysis yielded consistent results. No evidence of publication bias was observed. Although the role of potential bias and evidence of heterogeneity should be carefully evaluated, the present study suggests women giving birth to a girl are associated with a higher risk of developing PPD when compared with those giving birth to a boy. Improving family and social communication and reducing gender preference should be important components of any such interventions.Statement of significanceProblem or issue  Interestingly, the known risk factors leading to PPD are basically the same in different regions and cultures, but the gender of the infant seems to be an exception.What is already known  Some studies conducted in traditional western countries indicated that there is a weak or null association between infant's gender and risk of PPD, while others suggested a positive association. In contrast, studies conducted in Nigeria, India, Turkey and China showed that mothers giving birth to a female infant were at a higher risk of developing PPD.What this paper adds  Today, the association between infant’s gender and risk of developing postpartum depression (PPD) is still uncertain; additionally, a complete overview is missing. Our study represents the first meta-analysis of risk of PPD associated with infant’s gender. Problem or issue  Interestingly, the known risk factors leading to PPD are basically the same in different regions and cultures, but the gender of the infant seems to be an exception. What is already known  Some studies conducted in traditional western countries indicated that there is a weak or null association between infant's gender and risk of PPD, while others suggested a positive association. In contrast, studies conducted in Nigeria, India, Turkey and China showed that mothers giving birth to a female infant were at a higher risk of developing PPD. What this paper adds  Today, the association between infant’s gender and risk of developing postpartum depression (PPD) is still uncertain; additionally, a complete overview is missing. Our study represents the first meta-analysis of risk of PPD associated with infant’s gender.

Gender of infant and risk of postpartum depression: a meta-analysis based on cohort and case-control studies