Reynolds CME, et al. - BMI changes between successive pregnancies were examined in this longitudinal observational study. Researchers analyzed the computerized medical records of women who visited a large maternity hospital between 2009 and 2017 for their first and second singleton deliveries. They assessed 9,724 women; among these, obesity incidence increased from 11.6% in the first pregnancy to 16.0% in the second. This suggests an increase in maternal obesity between the first and second pregnancy, with one-fifth of nulliparas in the overweight category developing obesity. Pregnancy-related factors, such as a longer interpregnancy interval, formula feeding at hospital discharge, taking antidepressants or anxiolytics, and postnatal depression, were identified as predictors of developing obesity. A lower odds ratio of developing obesity was observed in correlation with professional/managerial employment.