Ds was bf until 19 months, drank water from a sippy straw cup at 7 months, drank water out of mugs, shot glasses, cups and sippys at 1 yr, but he had his bedtime bottle ( his beloved bot bot ) until 3 yrs! I never worried, it was his comfort and would only drink milk from a boob or a bot bot. He had it around 6 pm chill out time, we always brushed after and like you guys, didn't walk around with it or drink anything else out of it. We were both sad to see it go at 3 yrs. If your child drinks water from other vessels, I don't see a problem with it once a day. To this day at 7 years he only drinks water, milk or tea. Never asks for juice or pop.