weening off formula?

Kari
So my doctor gave me a paper during my sons 9 month checkup and it had a list of how baby should be progressing and such. On the paper it also had a list of foods they can't have like eggs peanuts milk etc. 
my question though.... if I were to introduce milks at his age (10months) would that hurt him?? He used to drink his bottle just fine but now he doesn't. I've always given him 6 oz and here lately he just hasn't been finishing them or seem interested in them. I dont know if it's because he's more active and he don't wanna sit still to drink it or if he is starting to not like it anymore. He eats table foods. I've done the BLW with him so i dont know if that has anything to do with him maybe not liking the taste of formula anymore? But i dont know what to do? His formula has a lot of vitamins in it that he needs. And I hear milk before 12 months is dangerous because their tummys aren't mature enough for it yet. 
 Not sure what to do? 
I've tried his sippy cup too, thinking maybe it doesn't come out fast enough for himfrom his   bottle but even in his sippy cup he won't always finish it. 

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