You should NOT give oral (by mouth) castor oil to infants. Most breast fed babies do not get constipated very often. Constipation is more common in formula-fed infants. Whether your baby is breast-fed or formula fed, call your physician for advice for constipation in infants. One thing you can try is to gently massage your baby's tummy. You can also rub castor oil on your baby's tummy-- but call your physician first.