traviolet (UV) rays from sunlight to activate it.
Breastmilk contains a small amount of vitamin D but that is not adequate for proper infant development; therefore, exclusively breastfed infants should receive a supplement of vitamin D shortly after birth.17 The current American Academy of Pediatrics (AAP) recommendations for vitamin D intake is 400 IU per day for all infants, children, and adolescents, beginning the first few days after birth.18
Deficiency of vitamin D is known as rickets and can have