welcome to healthcaremagic forum.
The pain on left side below ribs is a muscular pain
due to prolonged sitting you need to do to care for your baby. Tab. Ibuprofen
is fine . You can take it upto thrice daily as per your need.Do not take it empty stomach. Hot fomentation and a muscle relaxant
ointment like felini gel locally will also help you a lot.
Dr. Rakhi Tayal