Baby’s hair standing up may be related to heredity or malnutrition, parents are advised to closely observe the growth of the baby, if there is any physical discomfort or other adverse reactions, they should immediately go to the hospital for relevant examinations to find the cause of the disease and then do the treatment. 1. Heredity: Baby’s hair standing up may have something to do with heredity, if the parents’ hair is of this type, the growth angle of the baby’s hair follicles will also grow vertically, thus appearing the situation of hair standing up. 2. Malnutrition: If the baby is malnourished or has insufficient protein and amino acid intake, it may also cause the hair to stand up. It is recommended to make nutritional adjustments or micronutrient supplements for babies under the guidance of a doctor. Parents should help their babies to develop and maintain good dietary habits and work and rest habits, which will help the physical and mental development of babies.