The vitamin drops are completely unnecessary. They are made by formula companies and doctors push them because thats how formula companies get the money from breastfed moms as well. Its absurd, and the vitamins are poorly made, and the D in them is only about 3% absorbed anyway. Plus they contain fillers and chemicals that are just not good for anyone.
All it takes is 5mins of sunshine once a week for the body to produce enough Vitamin D. And if you are exposing yourself to a few minutes of sunshine a week, your milk contains vitamin D. the best part of this? Its 100% absorbed by the body and used properly because its HOW the body was meant to get it. Not through crappy synthetic drops that contain fillers and unnecessary chemicals.
I exclusively breastfed my boys, and neither ever took vitamins while nursing. AS long as you have a healthy diet that includes fruits, veggies, and grains, your child will be getting all he needs through your milk. As long as you expose yourself to sunlight, just a few minutes a week, your body will produce Vit D in your milk for your baby. If you expose him to a few mins of sunlight a week, he will absorb and make his own as well as what comes through your milk.
The vitamins are overpriced, made by formula companies, poorly made, and synthetic. You can give your baby the real deal for free, the real deal that is made for his body, absorbed 100%, and can actually be used by his body. Dont bother with the vitamins.