MrsR, my boys both dropped a bf or two around that age, but I don't think the quantity would have reduced by as much as you are talking about (hard to know though as obviously I couldn't really measure it). I would suggest giving him a little less food to see what happens. I'd probably reduce the dairy first, and just see if that increases the formula intake again. If it doesn't make a difference, then I'd go with the flow. Just make sure that he eats a balanced diet, gets enough calcium and enough fluid. GL.
Bookmarks