If your baby is 3 months old and finds that the hair at the back of the head is falling out more, this situation should be considered occipital baldness. When a child has occipital baldness at 3 months, part of the child is related to calcium deficiency and early rickets. It is recommended to take the child to a regular hospital pediatric clinic for consultation, and if this is the case, you need to supplement vitamin D, calcium supplements, etc. Take the child outdoors more often and get more sunlight. There are also some children with pillow baldness that may be related to pillow hardness, sleep posture, sleep quality, local sweating, etc. These conditions can be improved by suitable pillows, changing the sleeping posture, improving the child’s sleep quality, and keeping the local area dry.