Baby bottle First Choice, 300ml Silicon orthopedic Nipple NUK with backup extensive extra for lips and System Anticólico NUK Air System -a more natural form of diet -Neck wide extra to facilitate the filled and and l wash -ergonomic Form for a sure and more comfortable management -Comfortable thread, easy to open and to close -Cover to pressure that emits a sound when is placed on the thread to indicate that the nipple is sanitarily protected -Plug of security for avoid discharges last you the transportation -This baby bottle comes with the nipple Size 2M (medium orifice) for milke