An anti-colic nipple helps to prevent ingestion of air by baby, which may cause colic. Nuby has taken this one step further by adding the Nuby nipple with raised offset surfaces that assist in the eruption of teeth by gently massaging infant's gums. The first and only Non-Drip nipple is uniquely designed to prevent drips and spills. With a pressure sensitive valve feature safely built right into the nipple, fluid only flows out of nipple with sucking actions of baby. This special valve closes when sucking action ceases, ensuring a leak-resistant bottle. 3+ months 8oz/240ml 3 pack Standard Neck Graduated in both ounces and ml Soft silicone Non-Drip Vari-flo nipple with anti-colic air system Vari-flo valve allows child to control flow rate! Decorated with fun characters