Gestational diabetes is a form of diabetes that may develop in pregnant women. It affects about 18% of all pregnancies. In this type of diabetes, the mother has high levels of glucose (sugar) in her blood due to an inability to respond appropriately to a chemical called insulin. Insulin is a messenger that tells the body to break down sugars to make energy needed for daily life. For people with gestational diabetes, however, their body cannot convert sugar to energy the same way most people’s does. Gestational diabetes typically requires treatment during pregnancy to prevent complications of the condition to the mother and baby, but will usually resolve after delivery of the child. Treatment for gestational diabetes includes diet and exercise, although medication may become necessary if diet and exercise are not sufficient. One of the potential complications of gestational diabetes is macrosomia, meaning that the baby is excessively large at birth. This can lead to complications during the delivery and can put the child at risk for obesity and diabetes later in life.