So my baby just had his 2 months shots today. He was fine for about 4 hours and now he has been screaming bloody murder on and off for the past 2. Should I be worried? I just gave him some infants tylenol, but he also hasn't pooped for over 30 hours (usually only goes once a day). I will call my dr if the crying persists after the tylenol but just wanted to see if any other moms had their child react this way.