The mOmma Developmental Drink Set is uniquely equipped with interchangeable transition tops for when baby is learning to drink from a cup. It is recommended for ages 6 months plus. It has Air Ventilation System (AVS) which reduces gas. It has a spill-proof converter top with protective cap for maximum hygiene. The in and out straw system converter top, prevents leaks and provides maximum hygiene when on the go. It is microwave and dishwasher safe, BPA free, 100% silicone fast flow nipple, soft spout, and soft straw with a wide neck cup.