M.S.
My 14 month old twins still wake up once at night. Sometimes not at all?? I am clueless what happens different each day. So I feel for you.
However, at 9 months, they were waking up every 3 hours. It was driving me crazy. I got most of my help from Healthy Sleep Habits, Happy Baby by Marc Weissbluth.
We would let them cry, which felt monstrous. But it worked, within a week they were only waking up once, maybe twice.
I would have had to check into a mental institution if I did not get some sleep soon. Doing so much better now.
My idea is to let him have the bottle himself. I do this with my girls. I run in there hand them a ba and go back to bed(my girls are drinking soymilk). At least this way they are getting used to soothing themselves. I check on them about 20 minutes later and they have usually fallen back to sleep. I am hoping this will eventually phase out the ba and the girls will wake up but then go back to sleep on their own.
Good luck. It will happen!