At our 2 month pedi visit, he recommended we give LO a Vitamin D supplment since I EBF. We bought it, but only gave it to LO about 3 times in the last month [oops]. Honestly, I don't think it's really necessary, but I'm not the doctor.
Do you give one?

Re: Do you give LO a Vit-D supplement?
No.
Vitamin D can be transferred via breastmilk as long as mom gets a good amount of it in her diet. Your body also produces it naturally from exposure to sunlight. I can't remember the exact amount of time but in only a few minutes of sunlight a day, your baby can get enough to produce enough vitamin D. I *think* it was seventeen minutes?
DD (5 years old) from IUI in 2012
TTC 3rd and final!: IUI #1 in progress!
I will because of where I live. We're too far north to get adequate sun exposure on baby's skin from probably October - May (and the sun intensity isn't adequate to produce Vitamin D for about that period). I supplement myself, but I'd have to go overboard for that to transmit enough via breastmilk.
I think that for us, the data supports supplementation. I might feel different if I lived in California than I do in Saskatchewan.
Natural Birth Board FAQs
Cloth Diaper Review Sheet
Well I am sure you know that vitamin D actually isn't a vitamin. It's a hormone that works very closely with the immune system.
I don't understand the logic of 'you might take too much so don't take it all'. That makes no sense. If you are concerned about your and your LO vitamin D level then you should get it checked. Everyone should be getting checked.... Half the US doesn't get enough sun in the winter to actually produce Vitamin D so the whole 'go outside' doesn't work if you are in say Seattle.
I asked my doctor about getting my vit D levels checked. She said it was a waste of time; everyone she ever tested came back low. She said for me (and anyone else here), taking a supplement was a great idea.
Back in the day, babies got (unprotected) sun. That's no longer a great plan.
Natural Birth Board FAQs
Cloth Diaper Review Sheet
Our pedi highly recommended vit d, as it's still wintery here in MA. I bought Tri-vi-sol and LO loves it. It smells like licorice. I've never had a problem with him taking it. Of course, I don't always remember, so he probably gets it 5 times a week.
ps, If you do decide, I would suggest using a bib, as it seems to stain clothes.....