Lipworth H, Melamed N, Berger H, et al. - Researchers conducted this retrospective cohort study to identify the optimal range of gestational weight gain (GWG) in twin pregnancies and to explore the connection between inappropriate GWG and adverse pregnancy outcomes. From 2000 to 2014, all women with twin pregnancies who were followed in a single, tertiary center, were analyzed. In total, 1,274 women with twin pregnancies met the study criteria: 43 were classified as underweight, 777 were normal weight, 278 were overweight, and 176 were obese. In the normal-weight group, GWG below recommendations was correlated with an increased risk of preterm birth and birthweight < 10th centile, and with a decrease in the risk of hypertensive disorders, whereas GWG above recommendations was related to an increased risk of hypertensive disorders and a decline in the risk of birthweight < 10th centile. GWG has been identified as a potentially modifiable risk factor for preterm birth and other pregnancy complications in twin gestations.