Dark hands in babies may be caused by heredity, sun exposure and other factors. 1. Heredity: If the parents’ own skin color is darker, due to the influence of genetic factors, it may also lead to the baby’s skin is darker, appearing hand black situation. 2. sunlight exposure: sunlight contains ultraviolet rays, melanin cells in the skin become more active after exposure to ultraviolet rays, the baby’s hands after more frequent exposure to sunlight, easy to become black. Baby hand black may also have other reasons, it is recommended that parents take their children to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment, do not self-medication or gullible folk remedies, secret recipes to help children’s hands white.