hii my baby girl is 3 months old, she hasn't pooped in the last 3 days,what to do?

A. In this age kids don’t even pass motion for 15 days so don’t worry about it if your child is good comfortable and passing urine properly taking the feeding properly then do not worry about it just give it some time if the child doesn’t pass motion or discomfort then you can put a suppository into the anal region of the child