Baby forehead protrudes, the following conditions are common, 1, vitamin D deficiency rickets. Mostly seen in babies around 6-8 months of age, mainly manifested as cranial changes, forehead protruding as frontal square, accompanied by occipital baldness, square skull, rib ectropion, chicken chest, O- or X-shaped legs and so on. Babies are not given vitamin D supplement on time, need to be given vitamin D and calcium supplements, more outdoor activities in the sun, and reasonable addition of complementary foods, will gradually improve. 2, genetic metabolism or chromosomal lesions. The baby has a special face, forehead protruding, eyes with wide eye spacing or excessive hair, fair skin, short stature, accompanied by mental retardation, you need to go to the hospital in time for relevant examinations to clarify.