I think it probably depends on a) how much is in each bottle and b) how much he's eating from his meals. Every 9 month old will be different, so there are no strict rules. But if he isn't finishing his bottles, he's probably not hungry, which means he's had enough. You could try putting a bit less in some bottles (the ones he doesn't finish) if you're worried about wasting milk, rather than cutting out a feed entirely.
I think I was still giving my girls about 5 bottles at that age, but I was chatting to a friend the other day who has a little man a week or so older than my youngest and he was only having three bottles a day.
I think we were offering about 4 at that stage, but if I remember correctly she wasn't finishing all of them - she was probably drinking about 3 worth. She was also eating lots of solids too.
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