Can I lose significant Vitamin D from making babies and breastfeeding?

by Mrs. Henderson
(Florida)

I am a 44 y.o. mother of two boys: 7 & 5. I took pre-natals during pregnancy and while breastfeeding. I breastfed both kids for 2+ years. The first into my 2nd pregnancy (3 months) and the 2nd until he was 27 months. I suffered from PPD and feel like I've never really recovered from having my 2nd child. A physician did blood work, because I was worried about maybe having a thyroid problem, and found very low levels of Vitamin D (16). He put me on a weekly 50,000 mg vit. D supplement and (after 2 months) I am FINALLY starting to feel like myself again. I'm thinking it must have been the baby making and the breastfeeding that got my levels so low. Am I right? Thanks in advance :-)