The fluid in the mothers womb is less. This condition is called oligohydramnios whereby the baby has less space to move. This can be manifested late during pregnancy. You need weekly check-up by your gynaecologist. Your wife should maintain daily fetal kick count. Colour doppler study can be helpful. Blood pressure should be checked every week. A malformation scan should be repeated. You should deliver in a good hospital with good neonatal care; for if the baby's weight at birth is less it can be well looked after.