Jan, I can offer no official explanation here, but I had the same thing with both my kids, and it went away as soon as my milk "matured" a bit.  I have also had other women mention it briefly in passing.  I tried increasing liquids and decreasing salts and it DOES go away.I did not take vitamins, but I do eat lots of spice. 

Mirine Dye, CCE, CD, CLE
Serving the Florida Keys
Key Largo to Key West
www.keysmama.org

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