To avoid early labor and delivery, weight and diet changes not the answer

One of the strongest known risk factors for spontaneous preterm birth -- any birth that occurs before the 37th week of pregnancy, often without a known cause -- is already having had one. For women in this group who would like to avoid this scenario in their second pregnancy, focusing on weight and dietary changes may not be the best strategy. A new study found no connection between weight gain and the risk of repeat preterm birth.