The Chicco Step Up 2 Silicone Teat offers a medium flow rate for babies growing and drinking more. KEY FEATURES: ‣ Medium flow nipple: Accommodates increasing baby's feeding needs. ‣ Ultra-soft, silky silicone: Maintains a natural feel for continued comfort. ‣ Angled design: Continues to promote upright feeding and reduce air intake. ‣ Double anti-colic valve: Still helps prevent colic, hiccups, and spit-up.