Kids his age need 24oz of milk. 3 8oz cups a day, or 4 6oz cups a day. Don't give juice or water until he meets his milk minimum.
At 13mos he should be eating regular meals of breakfast, lunch and dinner with milk at each meal, and a morning and afternoon snack with juice or juice/water mix. But they do not get juice/water until the drink their milk from the previous meal. Getting in calcium is most important.
I'm very surprised your doctor said you didn't have to take the bottle away. A bottle is a tool, a tool for a child who cannot drink on their own. Once they can hold and tilt the bottle to drink then they don't need a bottle anymore. They're just using it out of habit and the sucking feeling. That doesn't teach them anything. Transitioning to a sippy cup is no better. Those are meant for travel only to not make a mess but too many parents have gotten lazy and use sippy cups so their kids will suck on those as well. The sippy cup companies feed on this and have convinced the public that sippy cups are a daily necessity, lol! Get your son a transition cup without an inner valve. These days there's not much to offer thanks to the sippy cup companies so try the disposable sippy cups where the drink drains out. This will teach them to swallow and not suck (make the holes larger if necessary) and then start teaching to use an open cup at home. All meals AND snacks should be eaten/drank at the table or high school. No roaming around with a sippy cup, period. Early good habits are great!
K. B
mom to 5 including triplets