Background: Population explosion continues to be a serious concern across the globe. The current world population estimate of 7.7 billion people is expected to increase to 9.7 billion by the year 2050. Despite the projected growth, recent reports have shown that approximately, six million infants died before their first birthday, and thirty-five women die per hour as a result of pregnancy and childbirth related complications. Postpartum Family Planning (PPFP) has been recommended to help protect women from unplanned pregnancies within the first six weeks of giving birth. An effective postpartum contraceptive utilization in developing countries could reduce the rate of maternal and perinatal morbidity and mortality. Thus, this study was aimed at examining the socio-demographic factors that influence postpartum care joint decision making and the use of family planning among the young female population in South West, Nigeria.Methods: The study involved the use of primary dataset collected among young mothers aged 15-30 years in South West, Nigeria, in 2019. Inclusion criteria including having a child in the year preceding the survey. One hundred forty respondents were interviewed in three senatorial districts to give 420 respondents, and the data collected were analyzed adopting univariate, bivariate, and multivariate measures.Results: The findings from the study showed that respondents across all the age groups were more likely to jointly agree with their spouse/partner concerning the use of family planning, and this was significant for the age group 25-29 years. Also, there was a significant association between family planning usage and a healthy, meaningful relationship between joint decision, and communication on the use of family planning after delivery (P-value < 0.05).Conclusion: This study revealed the importance of male partners in couple’s decision towards uptake of family planning services. It recommends that focused community orientation, and awareness strategies, including reproductive health education for couples, should be implemented at community grass root levels