How Much Vitamin D And Folic Acid During Pregnancy? in Pregnancy Posted January 17, 2012 · Report to Admin I have an 18month old now. I started taking prenatals 6 months before I got pregnant with her, so my folic acid was fine, but I wasn't supplementing vitamin D beyond the 1000 IU that were in my prenatals. By 8 weeks I was so significantly vitamin D deficient (despite drinking lots of milk, eating cheese, etc) that I got a severe infection and starting bleeding. I thought I was losing the baby, and it was terrifying. The doctor prescribed me some antibiotics and after the second infection at 15 weeks she tested my vitamin D (since low vitamin D and pregnancy are two factors for bacterial vaginosis). I was very deficient. She recommended I start taking 5000 IUs of Vitamin D daily along with what I was already getting through diet and prenatals, and I stopped getting infections and my daughter was born perfectly healthy and full term. And now that I'm no longer pregnant, I don't supplement vitamin D and my levels are perfectly fine. The baby needs a lot of vitamin D--don't be shy about taking what you (and your child) need for this very short period of time.