The influence of maternal body mass index (BMI) before pregnancy and weight gain during pregnancy on perinatal outcomes in the Japanese population remains to be elucidated. Therefore, we estimated the risk of perinatal morbidity of the mother and infant with respect to maternal prepregnancy BMI and weight gain during pregnancy in Japanese.
Department of Obstetrics and Gynecology, Yamagata University School of Medicine, 2-2-2 Iida-nishi, Yamagata-city, Yamagata 9909585, Japan. makim@med.id.yamagata-u.ac.jp