Baby King 6Pk Nipple Silicone Set is soft silicone that gives a comfortable feeding experience and helps avoid nipple confusion. It is perfect for switching from breast to bottle and back again. These medium flow nipples release breast milk or baby formula at a steady rate, satisfying the appetite of babies 2 months and older. The Nipple Set shape and small mouthpiece are ideal for newborn babies. The air valve prevents nipple collapse, allowing babies to drink at a comfortable rate. Its unique flat and symmetrical design, the nipples of the MAM baby bottle fit perfectly in the baby's mouth. They also fit all MAM feeding bottles.