N.A.
Ok, I know this might sound weird, but my daughter is 8 months old and I had the same problem. I flavor the formula with a little bit of juice, or put some jelly on a spoon and stir it in the formula for 2 or 3 seconds. It gives it a very faint sweet taste, and she can't get enough!!! She now takes five 7 ounce bottles a day of formula, plus two 4 ounce bottles of baby juice, and she's really happy about it.