Doctors prescribed vitamin d supplements to my newborn. ever since, he has not been drinking the full 5 oz of milk he drunk before. now its 3 or 4?

Milk: As long as your child takes 24 ounces of milk per day I wouldn't be concerned. Also you don't mention your child's age and if he is taking solids, in which case his milk intake would drop

Vit D: newborn need 400 iu of vit D as Breast milk is deficient in it it needs to be supplemented. Even as the child grows 600 to 800 iu is needed each day I.

Right Decision By MD: American Academy of Pediatrics recommends Vit D supplemet to al breast fed babies 400 iu per day beginning in the first few days of life According to cdc only 1in5 formula fed babies get enough vit D as recommended by American Academy Of Pediatrics.Babies who drink 34oz of formula a day get enough vitD as recommended I agree with your Pediatrician for VitD Supplement as adviced to prevent Ricketts