Pregnant Zombies

Everyone goes with the Dawn of the death remakes logic on this one but I think differently. During the normal course of a pregnancy, the mothers and babies blood does not mix or circulates together. The umbilical cord attaches to the placenta. The placenta is the "container" that keeps the baby "isolated" from the mother. The fetal blood flows through the baby, out the umbilical cord to the placenta and no further. The placental membrane separates maternal blood from fetal blood. I know what you're thinking, babies get the alcohol that is in your blood if you drink during pregnancy and babies can get the mothers diseases. Yes they do get alcohol but, only oxygen and nutrients in the maternal blood diffuse in the intervillous spaces through the walls of the villi and enter the fetal capillaries. This unfortunately means that bad things like alcohol and drugs diffuse through the membrane, also. And yes they can get diseases, but this only happens when their is a defect with the placental membrane and the mothers and the babies blood mix or if its a genetic disease and I've never heard of a genetic Zombie disease.  So going with that and if the fetus didn't just die after the mother turned, I would say that most of the births from Zombies would be normal human baby, but during the birthing of the baby the mothers blood does cover the baby and if that got in say the babies eyes I would think the baby would turn.