Dr. Brown's Options Sippy Spout is easy for baby to use and offers your little one the best and easiest transition from bottle to cup. This easy to sip, spill-proof sippy spout replaces the bottle nipple and vent. The soft, 100% silicone spout is gentle on little mouths and attaches and detaches from bottles in seconds. Easy to clean and is top-rack dishwasher safe. Fits regular 4oz/120ml & 8oz/250ml Dr. Brown's Options bottles. BPA free.