Personally I do not think a 5 mo. old baby needs to eat in the middle of the night. But if they get used to doing it, they want and expect it. I have a 2 1/2mo. old baby who is sleeping through the night. My other two slept through just as early. I know this could be just luck (and believe me... I'm VERY thankful) but after the first few weeks of her life, when she would wake in the middle of the night, my husband or I would try soothing her back to sleep without feeding her. Sometimes she could not be comforted in which case I would feed her, but other times she just needed/wanted the pacifier, or to be snuggled/rocked and she'd fall back asleep for another hour or two. Eventually she was only waking once a night and only for the pacifier. I did not automatically feed her, but tried EVEYRTHING else first, knowing that the ultimate goal was to get her to sleep through the night. I agree with one of the other responses that said the older they get, the harder it is to break a habit. I'd try to get her off the bottle in the middle of the night asap. It may be hard, but it'll be worth it b/c then you'll all be getting more sleep. GOOD LUCK!!!