My baby is almost 6 months and 2 days ago he can’t sleep he will sleep 30 min to 1hr max and wake up crying and nothing can comfort him 😕 , sometimes he goes back to sleep it’s been really hard.

At night is the same thing he will sleep and all of a sudden wake up crying and he won’t stop with nothing, since he was born he would sleep the whole night he would wake up when He was hungry and would sleep right back. Any one having the same problem? I thought it was his teeth coming but Idk. I’m starting to get worried he is usually a really calm baby.