Depression in early pregnancy more than doubles the risk of gestational diabetes which in turn increases risk of postpartum depression six weeks after giving birth says a study.Gestational diabetes is a form of diabetes occurring only in pregnancy and if untreated may cause serious health problems for mother and infant.'Our data suggest that depression and gestational diabetes may occur together' said study first author Stefanie Hinkle from US National Institutes of Health's Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD).'Until we learn more physicians may want to consider observing pregnant women with depressive symptoms for signs