5. Breastfeeding Infants
Infants exclusively or partially breastfed are at an increased risk for vitamin D deficiency. Breastmilk contains very little vitamin D, so breastfed infants must receive a supplement of 400 IU/day of vitamin D3.
Symptoms of Vitamin deficiency
Most people who are vitamin D deficient don’t have any symptoms. But if your deficiency is severe, you may have some of these signs and symptoms: