And while glucose levels will return to normal once the mother delivers, she remains at higher risk of developing diabetes later in life.
There are risks for her baby, too. Babies born to women with gestational diabetes tend to be bigger and are at higher risk for preterm birth, still birth, breathing difficulties and low blood sugar. They are also more likely to develop type 2 diabetes.
Doctors usually test for gestational diabetes between 24 and 28 weeks of pregnancy. While some women may experience increased thirst and more-frequent urination, most don't know they have the condition until they are tested.
Risk factors for gestational diabetes include obesity, lack of physical activity, polycystic ovary syndrome, prediabetes and family history of diabetes.