My son cozmodiar was breastfed (solely) from birth until about three and a half years. He never received a bottle until he was a little over a year old, and contracted some sort of lower GI tract bug which gave him severe diarrhea and his pediatrician suggested the breast be supplemented with pedialite. I agreed and gave him his first bottle, which he removed from his mouth, gave the evil eye and tossed aside, which amused me immensely. I just stuck the tit in his mouth and drank more liquids.