I think it depends, get her weighed, drop her to 3 and see how she does, aslong as she gains weight still then you know best. Charlie is 7 months and I am dropping to 3 bottles, well going to try, he has sr, never been a big milk drinker and paed told us to power on with solids and aslong as he gets between 15-20oz of milk inc dairy then they aren't worried at all x