The baby’s big head may be related to genetic factors, but also may be the emergence of diseases, such as the production of hydrocephalus, rickets and other diseases may lead to the baby’s head big. 1. Genetic factors, if someone in the family has a large head, it may cause the baby to have this symptom, and there is a certain genetic predisposition. 2. Hydrocephalus, after the baby has hydrocephalus, due to the oozing of tissue fluid from the brain, it may lead to an increase in head circumference and produce the symptom of large head. 3. Rickets, some babies with large heads may also be rickets, rickets will affect the growth and development of the baby, may appear head size, short stature and other symptoms. Baby head may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.