Objectives: This study__ampersandsignrsquo;s objectives were to determine proportion of Congolese women with post-partum weight retention and its average level; to identify its risk factors; to determine the proportion of obese women 6 weeks after delivery. Materials and Methods: A prospective study was conducted from 1st October 2012 to 30th June 2013. We followed up a cohort of 199 women, with a singleton pregnancy, recruited during antenatal care (which began at least at 20 weeks of gestation) in 2 maternity hospitals of Kinshasa. These women were also examined in the labor room and 6weeks after delivery. Our variables of interest were pre-gestational BMI, gestational weight gain and postpartum lifestyle. All data was analyzed using the SPSS 18.0 software. Results: The mean post-partum weight retention was 3.14 kg with a median of 3kg and extremes ranging from -5 to 17 kg; 75.4% of women were affected by this weight retention. High economic status (p = 0.04) and GWG (p = 0.000) are the main factors associated with weight retention 6 weeks after childbirth. The proportion of obese women increased by 8%. Conclusion: Our study found that majority of women had weight retention 6 weeks after delivery. They retained an average of 3.14 kg. Care providers should monitor the nutritional status (BMI) of postpartum women through lifestyle counseling.