Try give him solid food gradually. That is to say, do not stop feeding him with your milk suddenly. Suppose you feed him 7 times per day, then try to give him a little amount of solid food between two feeding. Try most mild food of course. If he does not reject it, try a few more times, and increase the amount gradually.
Later, the solid food can replace one of the 7 feedings. And little by little, you can reduce the frequency of breast-feeding and increase the frequency of solid food.
Thanks for your information hujf! So, I guess I don't need teach him how to use the bottle if I use this method then. Could you tell me apporximately how long does it take for him to wean from breast milk?