<prompt> Breast milk is deficient in which vitaminVitamin AVitamin B1Vitamin KVitamin C  <response>: Ans. is c i.e., Vitamin K Exclusive breasfed infants may have following deficiencies - Vit B12 if mother is strict vegetarian Fluoride Vit D Vit K Breastfed infants are protected as the breastmilk contains adequate amounts of vitamin C, except when the mother is deficient in Vitamin C. 