Learning to drink from a straw is an important developmental milestone that develops lip rounding and promotes speech development. The ezpz Happy Cup Straw System teaches older toddlers and preschoolers to safely drink from an open cup and straw independently. 24 months - Portion Size: 8oz - Straw serves as both a Training Straw an Advanced Straw- Reduces spillage- Weighted base and tactile bumps provide topple resistance- Made from high quality silicone that is BPA, BPS, PVC and phthalate free - Dishwasher and microwave safe