Sometimes pressure during birth can cause a swollen bump on your baby’s head. This bump is made of extra fluid in the tissue of the scalp, and will usually be reabsorbed within the first week of your baby’s life.
Occasionally a baby can develop something called a cephalohematoma. This is caused by a collection of blood between the baby’s skull and skin. A cephalohematoma can appear immediately, or several days after your baby is born. Don’t worry. The bleeding doesn’t involve the brain, and there’s no treatment required. It will normally go away within several weeks after birth. This is slightly more common with vacuum deliveries, but can even occur with Cesarean deliveries.