What is gestational diabetes?

Gestational diabetes mellitus (GDM) is a (usually) temporary form of diabetes that occurs during pregnancy. It happens when the hormones made by the placenta during pregnancy make it harder for insulin to work. Insulin is a hormone that helps process your food and keeps your blood glucose level stable. If you can’t make enough insulin your blood glucose levels will rise. High blood glucose levels can cause the baby to put on too much weight. This can impact on the baby’s wellbeing and your delivery and can affect the baby’s health later in its life.