Diabetes during pregnancy (gestational we talk about diabetes).
Children of mothers, who are overweight during pregnancy, also have a higher incidence of congenital defects, such as spinal bifida or spinal cord, heart defects, or defects of the abdominal organs. Read Our grow taller 4 idiots $2013--- here $2013
The causes of this association is currently rather speculates most blame high levels of insulin and estrogen in obese mothers. Obese mothers are also very often the fault of glucose metabolism or even have diabetes, a known risk factor for congenital defects of children.
The third factor is obi ovary unhealthy diet composition of obese mothers, which often contains nutrients necessary for healthy fetal development.