question: My 4.5 month old keeps cracking in left shoulder or neck area (?) followed by a painful cry....? It s increasing in frequency, and the same after administering advil (tried for pain and inflammation). the crying only last about 1 minute. Dr said he was teething, Chiro felt some tightness on left side of C2/C3. I know popping/cracking is normal, but why is he screaming in pain? Worried Mom.