My almost 7 month boy was sleeping pretty well in the night until a couple of weeks back. (Feed around 8plus, sleeps from 9 to sometimes 2-3 ish, at times 5am for feed) He has been waking up crying, 2-3 times each night. His bottom two teeth are out. Any idea what else could it be? He has been sleeping in his room since he was 4 months old and we have a baby monitor.