The innovative MAM anti colic valve regulates the drinking flow and ensures babies can drink calmly and relaxed without swallowing air. The anti colic valve is easy to place and remove in the MAM anti colic baby bottle and is compatible with all MAM Easy start anti-colic bottles. 80% of babies experienced less colic and regurgitation* while feeding thanks to MAM's vented base. MAM Anti colic valves are easy to clean and work as part of the venting system in MAM Baby bottles to help soothe baby's sensitive stomach. Includes 2 anti-colic valves to be used as MAM Bottle replacement parts. *Field study, Austria 2011, tested with 73 mothers of colicky babies / market research, USA 2010, tested with 35 mothers of colicky babies. Parenting is hard. We make stuff to make it easier. MAM knows that being a parent is not always easy, so we make products that are smart and simple to use. For over 40 years we've been obsessed with making innovative pacifiers, bottles, cups, teethers, and toothbrushes, providing babies with optimal care at all stages.