We sort of dropped the daytime bottles by accident. One day, DS decided to try milk from the kind of light cups you get from water coolers. That afternoon, we went out for coffee and I ordered him a glass of milk. From now on, he has been drinking milk from a special Thomas the tank engine cup that is only for milk
Having said that, I am TERRIFIED of dropping the night bottles, which he uses for comfort. I am trying to dilute the milk and encourage him to use his teddies for comfort at bedtime instead
I think the issue with bottles is "bottle carries" ie milk building up in the mouth at night and causing cavities. If milk does not interfere with solids and comes in something else than a cup, then I reckon it's fine