am in the same situation as you wan...but instead of 4 milk feeds I only give her 3 milk feeds at 6oz each. actually, i cut the number of feeds to 3 milk feeds because she was only drinking like 2/3 oz at lunch time, so now instead of feeding her milk at lunch (after solids), I put the milk into her food at lunch and she only gets one meal....so....
I give her a bigger meal for lunch and no milk afterwards...easier for me and I don't have to be wasting so much milk....
my daughter drinks about 18-22oz of milk / day and the doctor say that is average...so I will stick to that. I am actually hoping to cut the 4pm milk too and add that into her dinner, so she will only have two bottles per day by the time she is 1 years old (am and before bed)....feeding my daughter milk is getting more and more difficult as she is getting more and more smart...she REALLY enjoys solids, so she will wait for the solids and eat more....actually, I started giving my baby "baby yoghurt" a couple weeks ago (instead of adding milk to her food) so that her calcium intake was high....she seems to enjoy it! You can try too...it's baby yoghurt by Yoplait and it's marked on the top "yoghurt for babys from 6months onwards" so I assume it's safe....