Bottle-to-Cup Set, Wide Neck, 270 ml, Green WB91604 Dr. Browns. Take the next step in your child's development with the new Bottle-to-Cup Set. This set makes the transition from bottle nipple to cup spout easier. The bottle includes a Stage 3 nipple and an additional leak-proof spout made of soft silicone. When your baby is ready, simply remove the inner vent of the bottle and replace the nipple with a spout that prepares your baby for drinking from a cup. The set is designed for children aged 6 months and up. Dishwasher safe and can be sterilized in the top rack. Free from BPA, PVC, lead, and phthalates. Prevents nipple collapse and reduces the risk of ear infections. Reduces colic, spitting up, and gas.