HI, Thanks for the query. I understand your concern. Gestational diabetes is a cause of increased amniotic fluid. The explanation is as follows. Due to gestational diabetes, fetal blood sugar is raised & this leads to excessive urination in fetus ( osmotic effect ).. which causes increased amniotic fluid in gestational diabetes. As an effect of gestational diabetes, apart from maternal complications, fetus has high birth weight/pregnancy can turn in premature labor, abnormal fetal presentation during child birth. Please don t worry these can be prevented by controlling gestational diabetes by life style changes & few medications (as per advise by treating doctor ) Thanks.