At our 2 month well-child visit, our pediatrician likes to advise vitamin drops for the baby, specifically for vitamin D supplementation. I didn’t give Munchkin the vitamin drops more than a couple times though, because the popular knowledge in my breastfeeding-savvy group of friends said that we would get enough vitamin D from the sun. When Sweets was a baby, I revisited the issue and found new information. This time I concluded that in general we probably don’t get enough sun (“we” meaning Sweets and myself as well as “we” in our general culture) to make enough vitamin D as we are meant to by nature. I know that I always use sun screen on myself and I keep Sweets in the shade and put a hat on her and such. New research is finding that we should have even more vitamin D than was previously thought too. But I was still reluctant to give her the vitamins because a) they taste bad, b) they make a mess and stain when she spits them out, c) I feel like she should be able to get everything she needs from breastfeeding, and d) I don’t like having to buy a product made by Enfamil.
So I decided I wanted to supplement myself enough to have it pass though my milk instead. My pediatrician told me that it wasn’t possible for me to supplement myself enough that it would transfer a high enough amount through my milk. That seemed wrong to me, so I dug deeper. I take a prenatal vitamin with 400 units of vitamin D, and I initially thought that should be enough. I had bloodwork done to test my levels and they were 48 in my blood – which is fine for just myself, but not enough to be sufficient for the baby to get from my milk (blood levels are the same as milk, so she’d only be taking in 48 units). The recommended daily dose for infants is 200 units, so I needed to get my milk levels up that high too. I emailed with Dr. Jack Newman and asked his recommendation. Here is his reply:
Actually, there are studies that show that if you take 4000 Units of vitamin D (another study 6400 Units), a day, the baby can get enough vitamin D in breastmilk to prevent rickets. This is relatively new information.
If you are vitamin D sufficient, the baby is born with a liver full of vitamin D which probably lasts him for at least two months.
And you can get plenty of vitamin D from being outside. The baby doesn’t have to be out in full sun in summer to get it. Late in the afternoon for a few minutes a day is fine.
4000-6400 units is WAY more than the 400 units that are in my multivitamin. So now in addition to my multivitamin, I also take a 5000 unit vitamin D supplement, giving me a total of 5400 units per day. That way my own levels will be high enough for Sweets to get enough vitamin D through my milk and I don’t need to supplement her at all.
I showed the research to my pediatrician, who found it very interesting and concluded that the reason that this isn’t routinely advised is because the published toxicity levels for vitamin D are only 2000 units and they can’t advocate taking more than that. My research leads me to believe that the published toxicity levels are too restrictive, so I am willing to take the risk.

