C.M.
Have you been giving your son a sippy cup? they say you should start this at about 6 months. I use half juice and half water in the cup. Once he gets use to the cup then you should be fine, he will take to the cup instead of the bottle.
Do you put the bottle in bed with him? I have a problem doing this, I sometimes am so tired that I don't have a choice. I have a nine month old on top of a two year old and they gang up on me in the middle of the night.
well i hope this helps