The hormonal changes that occur during pregnancy do a lot to support a baby and get the body ready to give birth—they increase blood flow, expand the uterus and start to produce breast milk.

But hormonal fluctuations may also be responsible for causing gestational diabetes, which occurs in 2-10 percent of pregnancies in the U.S., according to the Centers for Disease Control and Prevention.

Gestational diabetes, like types 1 and 2, disrupts insulin and blood glucose levels, and can pose serious risks to both the mother and the baby. The condition is associated with high blood pressure and increased chances of C-section birth—plus about half of women with GD go on to develop type 2 diabetes.

An overview of gestational diabetes

Though there is no concrete origin for the development of gestational diabetes