Resistance to insulin develops in all mothers during pregnancy. In about 2-4 per cent of women this results in temporary diabetes.

It happens because pregnant women have less ability to produce extra insulin to overcome this insulin resistance.

Pregnancy diabetes is also called gestational diabetes.

Pregnancy diabetes is more likely:
if you're older (over 25)
if you're overweight
if you smoke
if there is a family history of diabetes
if you're from a minority ethnic group.