One vitamin, in particular, is vitamin D, simply for the fact that we do not receive enough sunlight to metabolize vitamin D in the cholesterol of our skin. Which is why all babies, whether breastfed or formula-fed, need supplementation. However, there is good news from recent research.
If a mother supplements herself with 6400 IU of vitamin D a day, enough passes through the breastmilk to satisfy the baby’s needs, as well. Vitamin D and a healthy gut biome can also reduce the rates and risks of postpartum depression, anxiety, and psychosis in the mother. Natural sources of vitamin D are dairy, bone-in meats and fish, mushrooms, and the cholesterol in our skin getting sun exposure.