PRACTICE BIG KID DRINKING. As baby’s feeding progresses, introduce Dr. Brown’s Silicone Handles to help them develop independent drinking skills and transition from bottle to cup . MAKE AN SMOOTH TRANSITION. Add silicone handles to the narrow bottle baby is already familiar with for an easy transition. FITS NARROW BABY BOTTLE. Fits all Dr. Brown’s Narrow Bottles and most other narrow bottles. NO-SLIP, EASY GRIP. Anti-slip silicone and thin, grippy handles designed specifically for little hands to hold help baby practice motor skills. LIGHTWEIGHT AND FLEXIBLE. The soft silicone is gentle on skin and the lightweight, flexible design makes picking up the bottle easy for little one.