Answer: There are various reasons a baby may move less.
Babies experience cycles of sleep while they are in the womb, these will mostly last between 20 and 40 minutes, however they should not last for more than 90 minutes. Your baby will not usually move during their sleep periods.
Mothers emotional and physical state can influence the amount a baby will move. The hormones released during periods of stress for the mother can cause the baby to temporarily move less. Dehydration and fasting can also cause the baby to move less, it is important to eat and drink well to ensure the health of the baby. Decreased fetal movement is sometimes caused by a leak or rupture in the amniotic sac that surrounds the baby. Membrane rupture or waters breaking is a normal part of a full-term delivery, but when the fluids leak before a woman’s due date it is often a sign of trouble. The amniotic fluid is what keeps the developing baby stable, warm, and protected. Leaks can lead to stress and problems with nutrition and oxygen, and also make infection more likely. All of these can lead to slowed or stopped movement.