Because there isn’t enough fluid around the baby.
Low amniotic fluid during pregnancy can cause premature labour. If your baby isn’t getting the nutrients it needs from you, it may start to feed less, which can make you feel unwell. Resulting in a lack of appetite and difficulty breathing. Low amniotic fluid can cause your baby to become stressed. If you notice swelling in your hands, feet or face, it may show that you have too little amniotic fluid to support your developing baby. Swelling is one of the most common symptoms of low amniotic fluid during pregnancy. It will help increase the blood flow to the fetus and encourage movement.