A.M.
My baby girl just turned 5 months this week. She's been waking once during the night for several weeks now. One night recently she slept through the night. She used to sleep consistently through the night, too.
I think the culprit is the 2 teeth that are poking through on the bottom gums. I think the pain must wake her/disturb her during the night and then remind her that she's hungry because she demands a bottle when she wakes at 2 am -ish.
So perhaps, your little guy might be teething?? Can you see if the bottom gums (front) are swollen? They'll be swollen/reddish before the teeth poke through.