I total breadfeed my son who is now one year old, same thing I did, I tried to introduce bottle, when he was, 3/4/5 months old, but to no success, he cried and refused to give in to bottle, I tried several brands too. My baby doc said baby associate mommy,s teats with mommy, and since sillicon teat is hardly mommy, naturally baby refused to have it. You may try to give milk in other form like cup or spoon and see if he is OK with it. All the best. Take good care of yourself too, its tiring but fulfilling to be a mom.