Laboring in bed, possibly flat on her back, the woman's uterus is compressing the blood vessels that supply the placenta and the baby with oxygen. Too little oxygen and stronger contractions may mean that the electronic monitor could show fetal distress. Failure to progress, incoordinate uterine contractions, and fetal distress are all reasons to have the doctors do cesarean surgery. Cesareans and the accompanying medications can affect breastfeeding. Studies have shown that allowing women to eat and drink during labor can reduce the length of the labor by as much as 90 minutes.
Labor is hard work, and the body needs the energy to work effectively.
Dehydration means more painful contractions and slower labor. Fatigue combined with a slower labor may make a woman feel that she needs medications. And we all know that medications get to the baby and can affect breastfeeding. The body compensates by making extra insulin. Suddenly the baby is born, it's glucose supply is cut off, and it has all that extra insulin.