M.,
I too have a newborn. Since I am breastfeeding exclusively I was told by the nurse practitioner to buy "Carlson Baby D drops" at a health food store in our area (All Ways Healthy in Lake Zurich).
It only takes one drop per day to fulfill the needed requirements to boost immunity, for health and development. It was a bit pricy at $22.50 for a 11ml bottle, but my child takes it while nursing (applied directly to the breast before I start the feeding) and has had NO side effects. I'd guess it's tasteless too b/c the baby has never made a face or turn away after starting to nurse.
She also said it could be applied onto food or into formula also.
I hope this helps! And congrats on the new baby!
Sara
Note: I saw the other replies. She said to try the Vit D drops since PolyVisol & TriVisol can stain clothing and that he didn't need any of the other vitamins.
I had used both of them before with other babies. When I asked why we needed D she said it was because D helps boost immunity and they are recommending anything to help the babies fare well through the cold and flu season. Plus since this is D only it's not from the formula companies. The only other ingredient is vegetable oil with no preservatives, colors added, etc.
Also, because we have "fall/winter babies" she said they simply can't get the direct sunlight needed to make it naturally in their own bodies. I asked, she said that window sunlight doesn't count as "direct sunlight" and that in the Midwest we don't get enough UVA rays in the wintertime anyway.
From the Tribune: http://archives.chicagotribune.com/2009/mar/22/health/chi...
Also from WebMd - check out page 2 for the AAP's recc on Vit D supplements in 2008 - http://www.webmd.com/osteoporosis/news/20080519/supplemen...
For $22.50 - I'll try to "naturally" boost my baby's immunity with all the cooties going around - especially if my drs office recommended it.
E-mail me if you want to talk more!