We started a regular cup at mealtimes and (seated) snack times around 18 months (maybe occasionally before). My oldest is almost 3 and still has a sippy of water at her disposal throughout the day, and she drinks two cups of milk from it (she drinks her milk in the morning and after nap, not with meals). It's a straw sippy. I don't really see any reason to stop offering them that way until she stops on her own. Especially having a smaller one around... minimizes spills!
at 10:33 AM on Mar. 14, 2010