Vitamin B12 - Health Professional Fact Sheet
ods.od.nih.gov › factsheets › VitaminB12-HealthExclusively breastfed infants of women who consume no animal products might have very limited reserves of vitamin B12 and can develop vitamin B12 deficiency, sometimes very early in life . The infant’s deficiency can be severe, especially if the mother’s deficiency is severe or caused by pernicious anemia; sometimes, the mother’s own deficiency is clinically mild and not recognized.