Unlike the symptoms in diabetes type 1 and 2, gestational diabetes symptoms are hardly recognized as signs of diabetes due to the pregnant condition of a woman. They are often manifested in the form of excessive thirst and frequency in urination, but are usually treated as part of the child-bearing stage.

The main gestational diabetes symptom indicative of the disease is the elevation of the blood sugar levels. Hence, great care should be taken that high blood sugar levels should be treated with utmost urgency in order to avoid any complications that can affect the woman’s pregnant condition. The following information about gestational diabetes may be useful to any pregnant woman: Gestational Diabetes Symptoms » » »

Like the question states, what type of diabetes happens during pregnancy.
More importantly, why does the head of most babies are usually abnormally large after such a pregnancy?
I am more looking for an answer on why there heads are usually large after such a pregnancy.

It is a question my teacher has been asking and he wants to know why.