Through the placenta.
Placenta is a disc-shaped tissue embedded in the uterine wall. Embryo derives its nourishment from the mother’s blood through the placenta. Placenta contains villi on the side of the embryo and blood vessels surrounding villi on the side of the mother. Oxygen and glucose pass from the mother to the embryo through the placenta. In addition, the wastes are also removed into the mother’s blood through the placenta.