Newborns with thinning hair at the fontanel area may be caused by genetic factors, insufficient nutrition of the mother during the fetal period, etc. Genetic factors do not need treatment, and if it is insufficient nutrition, it needs to increase nutrition. Some newborns have thinning hair in the fontanel area, which is mainly inherited from the father or mother. If the father or mother has this symptom, the child is likely to have this condition and does not need special treatment. It may also be because in the fetal period, the mother’s intake of nutrients is insufficient to cause the newborn congenital nutritional deficiencies, thus appearing fontanel area hair thinning, generally need to follow the doctor’s instructions to the newborn supplemental nutrition, such as vitamin D, vitamin B, etc., in daily life you can take newborns to sunbathe more, but to avoid direct sunlight on the eyes. If the hair does not improve as the newborn grows, the newborn can be taken to the hospital to be evaluated by a specialist.