So the fetal kidneys excrete urine into the amniotic sac and then the fetus ingests that back in and this process promotes normal fetal growth. So if the fetal kidneys are underdeveloped, the fetus can have significant problems because it doesn't have enough amniotic fluid supporting its growth. Crazy, right?! Bet you never made that connection.
P.S. Oligohydromnios = reduced amniotic fluid; This photo just shows different problems that can cause oligohydromnios.
