The causes of heavy sweat hair in newborns include the following two conditions: first, due to excessive secretion of androgens in the body. If the body androgen secretion is too much, body hair will be correspondingly increased or thickened, such as the newborn’s hair is very luxuriant, sweat hair is also very heavy, this belongs to the body androgen secretion caused by too much. Second, due to genetic factors. If the father or mother of the newborn has heavy sweat hair, it will be passed on to the newborn through genetic inheritance, and the newborn will also have heavy sweat hair. This is a normal genetic factor and parents need not worry too much about it. In addition to the heavy sweat, all other conditions are good at this time, such as the mental state, feeding situation, weight gain are normal.