How often does your baby poop?

Lauryn
My LO is four months, and for the last week has been pooping several times a day. Does not seem like diarrhea... She has been getting more formula since I have gone back to work, so I didn't know if that had something to do with it, or if I should be concerned. Any mamas have experience with this? How often does your four month old poop? Should I call the doc?