Baby’s posterior occipital bone protrusion is common in the following two cases: 1, belongs to the normal phenomenon, the baby’s head shape and genetic and usual sleeping posture, monitoring the head circumference is normal, the baby’s mental state is good, neurological and psychological development is normal, to regularly take the baby to the child health department for physical development monitoring. 2, intracranial tumors, such as tumors at the cerebellum to increase intracranial pressure, mostly accompanied by headache, vomiting or mental irritability, head circumference increases If there is any of the above manifestations, the baby should go to the hospital in time and have a cranial CT examination to clarify and give surgery if necessary.