D..
Pediatricians want kids to be weaned from bottles around their first birthday. I would give him water in his bottle to get him love it less. Put his milk in a sippy. Until he gets used to this, put a lot of milk in the food he eats so that he gets enough.
Don't EVER let him walk around with the bottle. Kids end up carrying their bottles with dirty fingers on the nipples, dropping them on the ground, etc. He can only sit down in the kitchen to drink from the bottle. This will help him lose interest, and then the bottle disappears one day.
Good luck.