The association between early in marriage fertility pressure from in-laws’ and family planning behaviors, among married adolescent girls in Bihar and Uttar Pradesh, India

Background Married adolescent girls are vulnerable to risky sexual and reproductive health outcomes. We examined the association of fertility pressure from in-laws’ early in marriage with contraceptive use ever, parity, time until first birth, and couple communication about family size, among married adolescent girls. Methods Data were taken from a cross-sectional survey with married girls aged 15–19 years (N = 4893) collected from September 2015 to July 2016 in Bihar and Uttar Pradesh, India. Multivariable regression assessed associations between in-laws’ fertility pressure and each outcome, adjusting for sociodemographic covariates. Results We found that 1 in 5 girls experienced pressure from in-laws’ to have a child immediately after marriage. In-laws’ fertility pressure was associated with lower parity (Adj. β Coef. − 0.10, 95% CI − 0.17, − 0.37) and couple communication about family size (AOR = 1.77, 95% CI 1.39, 2.26), but not contraceptive use or time until birth. Conclusions Our study adds to the literature identifying that in-laws’ pressure on fertility is common, affects couple communication about family size, and may be more likely for those yet to have a child, but may have little effect impeding contraceptive use in a context where such use is not normative.