M.Z.
Any big change is the babies diet is going to effect her. My little one doesn't go on a regular basis at all (he's 5 weeks). I was concerned also. My doctor told me that there is no need to worry. Babies can go up to a week or more without having a bowel movement. He said unless it is solid (like little pebbles) or he screams like it is really painful. I would not keep switching her diet. Try one formula and stick with it for quite some time. My doctor said not to switch formulas more than once a month. I'm new at this too, but literally just went through it two weeks ago.