We can often see some babies with prominent foreheads, and many mothers come to the hospital because their children have prominent foreheads and are worried about the impact on their children’s appearance. Generally speaking, the high forehead of infants is mostly related to genetics, as long as the child is supplemented with vitamin D on time after birth, and the forehead of adults in the family is also high, consider the genetic relationship. After excluding the genetic factors, some children do not supplement vitamin D on time, so we should pay attention to whether there is vitamin D deficiency rickets, vitamin D deficiency rickets can lead to the development of the child’s skull into a square skull, forehead skull protrusion, both sides of the skull is square-shaped. Once it is clear that the forehead protrusion is caused by vitamin D deficiency, then you need to give the child more sunshine and actively supplement vitamin D treatment, as the child grows older, there will be gradual improvement. In addition, some children with chromosomal disorders may also have a protruding forehead, but in addition to a protruding forehead, they also have some special facial features, and it is recommended to consult a pediatrician and have a chromosomal examination if necessary. In conclusion, when an infant has a prominent forehead, the first thing to rule out is vitamin D deficiency rickets, because rickets is a common disease at this age and can affect the child’s bone development, and attention should be paid to the timely supplementation of vitamin D in every child after birth.