1. Reasons why babies have high foreheads There are many reasons why babies have high foreheads, which may be caused by nature or acquired factors. The most common cause is genetics. If a parent or grandparent has this condition, it is likely that the child will also have this condition. In addition, when the baby is in the mother\’s belly, if the fetal position is incorrect or the fetus is too large, it will also cause a high forehead. 2. How to judge the baby’s forehead