J.K.
have you tried putting his hands on it with yours like hes kind of " helping" you hold it. my daughter did the samething till she was 8months old then she wouldnt even take her bottle anymore. so i started giving her a sippy cup an she held that just fine. maybe he thinks hes " to big" for the bottle lol... babies to have their own minds ya know lol. they try to grow up to fast. good luck :-)