Yasuda S, et al. - In Japanese mothers with gestational diabetes mellitus (GDM), researchers studied the associations of pregestational body mass index (BMI) and gestational weight change with birthweight for gestational age. From January 2011 to December 2016, the clinical and laboratory characteristics of 101 mothers with GDM who received maternal care at a single center were retrospectively examined. According to results, changes in gestational weight were 6.22 ± 5.39 kg and infant birthweights were 2,987.3 ± 393.6 g. Findings suggested a significant association of pregestational body mass index ≥ 25 kg/m² and excessive gestational weight gain with increased infant birthweight in mothers with GDM. To verify the effects of adequately controlling pregestational and gestational weights on infant birthweight for gestational age, the authors advised that a prospective multicenter clinical study enrolling a larger number of mothers with GDM will be needed.