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