This Playtex Baby VentAire Bottle Set is designed to help prevent colic and reflux in babies from 3 months and up. With a wide nipple and anti-colic features, these bottles also come with a shatterproof and dishwasher safe design for convenience. The set includes three 260ml/9oz blue bottles with fast, medium, and slow flow nipples made of silicone material. The VentAire model features a wide neck, angled, and standard bottle types, making it adaptable to your baby's needs. The bottle material is made of silicone, which is durable and easy to clean. The nipple material is also made of silicone, ensuring that your baby is safe from harmful chemicals.