Diabetes occurs when there is a higher level of glucose in the blood than is normal. Glucose comes from the breakdown of the food you eat. It travels through your body in the blood. A hormone called insulin then helps glucose move from your blood to your cells. Once glucose is in your cells, it can be used for energy. A problem making or using insulin means glucose cannot move into your cells. Instead, the glucose builds up in your blood. The build-up is called hyperglycemia.

Gestational diabetes is a type of diabetes that first occurs during pregnancy. The extra glucose can affect the mother and the baby.

Large Baby Due to Gestational Diabetes
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The exact cause is unknown.