Gestational diabetes is a condition where mom develops diabetes late in her pregnancy. Normally in gestational diabetes, moms are not diabetic before they get pregnant however during the pregnancy for a number of factors mom will develop diabetes. This can pose risks for the health of the baby. In a gestational diabetic mom the babies are often larger than they normally would be because of the amount of sugar which the baby gets because of mom's gestational diabetes. In the case of a baby of a gestational diabetic there is a risk that the baby's trunk or chest will be larger than the baby's head. Normally the baby's head is the largest presenting part but in a baby of the gestational diabetic mom the trunk and shoulders are larger and may be too large to be delivered safely.