A mother brings in her 2-week-old infant for a well child check. She reports that she is primarily breastfeeding him, with occasional formula supplementation. Which one of the following should you advise her regarding vitamin D intake for her baby? A. Breastfed infants do not need supplemental vitamin D B. Intake of vitamin D in excess of 200 IU/day is potentially toxic C. The baby should be given 400 IU of supplemental vitamin D daily D. Vitamin D supplementation should not be started until he is at least 6 months old
