Gestational Diabetes (GDM) is a frequent complication of Diabetes. Gestational Diabetes is the development of elevated blood sugar in pregnancy. Certain hormones produced by the placenta can lead to elevated blood sugar later in pregnancy. This problem can be diagnosed by doing a glucose tolerance test near the end of the second trimester. If untreated, GDM, can lead to excessive fetal weight gain and prematurity. GDM can be treated with dietary modifications and many times, insulin.