Su XJ, et al. - Researchers conducted a hospital-based retrospective cohort study including 36,596 Chinese women who gave birth to a live singleton infant from 2015 to 2018 in order to ascertain how early body mass index (BMI) is associated with the risk of preterm birth in Chinese women. Based on the most recent criteria for Asian women, they classified women as underweight (BMI < 18.5), normal weight (BMI 18.5 to < 23), overweight (BMI 23 to < 27.5), or obese (BMI ≥ 27.5). Outcomes suggest that risk for preterm birth is higher among women with overweight and obesity; the higher risk was observed regardless of gestational weight gain in early pregnancy. This supports weight loss before conception as beneficial for both overweight and obese women who plan to become pregnant.