Answer:
a hot bath can indeed seriously affect a developing baby.
An increase in the temperature will in turn heat the fluid in the amniotic sac thus affecting the baby. And while you can sweat out the excess heat, your baby cannot. The temperature of the water will automatically raise the core temperature of your body causing dehydration and overheating. Not only will this extra heat damage the developing cells of the baby but it will also prevent the oxygen from reaching the embryo. Along with that it will increase the heart rate and reduce the blood flow to the fetus thus stressing out the baby. The serious threat of this is that it might lead to malformations or birth defects in the baby and could also bring about miscarriages.