A condition in pregnancy in which high blood glucose (sugar) levels develop. About 3%-5% of all pregnant women in the U.S. are diagnosed with gestational diabetes. The following conditions increase the risk of developing gestational diabetes: being over 25, family history of type 2 diabetes, having prediabetes or prior gestational diabetes, obesity, high blood pressure, and being of non-white descent. Women with this disorder are more likely to have abnormally high birth weight babies (macrosomia), babies with low blood sugar (hypoglycemia), babies that develop type 2 diabetes later in life, premature deliveries, and problems delivering the baby secondary to the large size of the baby.