poop around every 2 days

Hi.. My baby girl is soon to be 1 mth but she has issue pooping. We have to assist her by lifting her leg up during diaper change and wait for her to poop, other wise it seems she has problem pooping on her own.. Another issue is she poops around every 24 to 36hrs.. She is on FM.. Checked with doc but they say she does not have constipation..