A 3-year-old child’s head suddenly protruding several bones, may be nutritional deficiencies or the presence of cranial osteoma, etc., it is recommended to immediately consult the doctor, according to the cause of the medication, surgical treatment. 1. Nutritional deficiency: if the baby has obvious vitamin D deficiency or calcium deficiency, we can improve the blood vitamin D, blood calcium, cranial X-ray examination, etc., and follow the doctor’s instructions to take vitamin D or calcium tablets orally, and at the same time, we can participate in outdoor exercise appropriately. 2. Existence of cranial osteoma: If the protruding part of the skull is in the forehead or top, and there are headache, seizures and other clinical manifestations, it is necessary to consider the existence of cranial osteoma, which can be perfected by cranial CT and cranial X-ray, and then the surgeon can remove the swelling after evaluation, and at the same time perform a pathological biopsy, and then carry out the next step of treatment according to the results. When parents find that their baby’s head suddenly protrudes several bones, it is recommended that they take their baby to the hospital in a timely manner to clarify the cause and actively treat it.