Learning to drink from a straw is an important developmental milestone that develops lip rounding and promotes speech development. The ezpz Mini Cup + Straw Training System teaches toddlers to drink from an open cup and safely learn to use a straw. As a versatile tool for infant development, the ezpz Mini Cup + Straw Training System is suitable for children aged 9 months and up. It easily transitions from an open cup to a straw-drinking format when your child is ready (between 9-12 months and older).