Sounds to me like she's just fine. I think it's natural to go thru phases where they drink less formula. My DD loves solids, so I have to be careful not to overfeed her because then she won't want her bottle at all. Rachel started solids at 5 1/2 months and for a while it was 1 tsp of cereal and 1 TBS of fruit or veggie. Then she got to loving it, and she can eat 1 TBS cereal and 1 jar of baby food. That works out to about 3 oz total at each sitting 3X a day. We do yogurt and fruit for lunch, about 2 oz yogurt & 2 oz fruit. But, we have those days when it's too much and she'll eat less bottles. I'm not worried about it at all because she's a good weight, eating good food, and when she refuses a bottle, we skip the next solids meal and she wolfs down her bottle again.