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. 9 months+-Portion Size: 4oz -Helps toddlers succeed with the 3-Phase Developmental Drinking Method-Straw serves as both a Beginner Training Straw + an Advanced Training Straw-Soft silicone protects baby / toddlers developing gums + teeth -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