A Few Days From 4 Months Baby Girl. Believe She

A few days from 4 months baby girl. Believe she is teething. But no bowel movement other than urine for 3 days. No temp. On Similac Advance. Periodic screeming during crying. Took 2.5 ml of infant tylenol this morning but her mother doesn't want to give her more, afraid of the side effects. This is grandfather and grandmother emailing.