The mother's blood does not normally mix with the baby's blood during the pregnancy unless there has been a procedure (such as amniocentesis or chorionic villus sampling) or vaginal bleeding. These antibodies will then bind with the baby's Rh-positive red blood cells, causing them to be destroyed.
The fetus is connected to the placenta and umbilical cord inside of the mother’s uterus. when the mother consumes harmful substances, they can reach the fetus’s own bloodstream after it travels through the umbilical cord.
