Common causes of white on baby fingernails include zinc deficiency, iron deficiency, etc.. 1. Zinc deficiency: the lack of zinc in the baby’s body, manifested in the lack of luster of the skin, picky eaters or xenophagia, usually the baby loves to bite the nails, easy to cause slight trauma to the nails into the nail trauma, thus forming the fingernails have white. 2. Iron deficiency: two years old before the baby is prone to iron deficiency anemia, anemia will cause the baby’s nails are relatively thin, fragile, nails will be easily injured, appearing fingernails with white. Lead to the baby fingernails have white in addition to zinc and iron deficiency, can also be seen in fungal infections, trauma, etc., when the baby found on the nails have white, can not blindly make up for calcium and zinc, need to take the baby to the hospital to find out the cause of the disease, standardized treatment under the guidance of the doctor.