Objective
To evaluate the association between body composition from early pregnancy to 42 days postpartum and postpartum weight retention (PPWR).
Design
This retrospective cohort study was conducted at Chengdu Shuangliu Maternal and Child Health Care Hospital from June 2020 to December 2021.
Setting
The study was conducted in Sichuan Province, southwestern China.
Participants
A total of 673 pregnant women at 6–13 weeks of gestation were included.
Outcome measures
Demographic and health information of participants was collected from the electronic medical record system using a self-designed questionnaire. Body fat percentage (PBF), fat mass (FM), fat-free mass (FFM), lean mass (LM) and protein were measured using bioelectrical impedance analysis. Logistic regression and restricted cubic spline (RCS) analyses were performed to examine the association between body composition and PPWR.
Results
During early pregnancy, compared with the bottom quartile group, women in the top quartile group of PBF and FM levels had a 51% (95% CI 0.24 to 0.99) and 64% (95% CI 0.17 to 0.76) lower risk of PPWR, respectively. For each SD increase in PBF and FM levels, the risk of PPWR decreased by 29% (95% CI 0.55 to 0.91) and 35% (95% CI 0.50 to 0.85), respectively. In contrast, at 42 days postpartum, for each SD increase in PBF, FM, FFM and LM levels, the PPWR risk elevated by 251% (95% CI 2.70 to 4.62), 315% (95% CI 3.15 to 5.57), 56% (95% CI 1.30 to 1.89), and 71% (95% CI 1.42 to 2.09). RCS analysis revealed that PBF and FM levels during early pregnancy were negatively correlated with the risk of PPWR (p-overall