This nipple is super stretchable to encourage the baby’s natural suckling. Teat section has an “accordion-like” portion that enables it to stretch in response to the peristaltic movement of the baby’s tongue. The nipple’s surface is very soft, yet it does not collapse easily. Made from thick ultra-soft silicone material, the nipple has similar elasticity to that of a mother’s actual breast. The dome-like shape makes baby’s mouth open naturally, supports its mouth softly and fits its lips gently. Small (S) type of nipple hole is recommended for newborns up to three months old baby for slow flow. Also available in S, Y-cut and L nipple sizes.