2-year-old baby forehead skull protrusion may be a normal phenomenon, or it may be caused by rickets, intracranial diseases and other reasons. 1. Normal phenomenon: 2-year-old baby forehead skull protrusion may be hereditary, if there is a forehead more prominent parents, it is likely to inherit this gene, which leads to the baby forehead skull protrusion, but this situation is generally normal, do not need to worry too much; 2. rickets: 2-year-old baby excessive lack of vitamin D may lead to rickets, manifested in the forehead skull protrusion, generally issued in the baby 5 to 6 months, because at this time the baby’s development is faster, need a large amount of vitamin D, if the lack of, will lead to 2-year-old baby forehead skull protrusion and other symptoms. 3. intracranial disease: the baby’s skull size is a normal range, more than the range is likely to be the existence of intracranial disease, such as brain cysts, gliomas, etc., may lead to 2-year-old baby forehead skull protrusion. If you can not determine the cause of the baby forehead skull protrusion, it is recommended to go to the hospital for a clear diagnosis, if suffering from diseases, should be treated under the guidance of the doctor.