FLOWS EASILY WHEN SIPPED;HELPS MAKE THE TRANSITION FROM BREAST TO BOTTLE TO CUP EASIER;SPILL-PROOF, SOFT SPOUT - DESIGNED TO BE GENTLE ON GUMS WHILE TEACHING BABY TO DRINK FROM A SPOUT;EXTRA WIDE NECK FOR EASIER CLEANING AND FILLING;EASY GRIP HANDLES, ERGONOMICALLY SHAPED WITH ANTI-SLIP SOFT GRIPS MAKES IT EASY FOR BABY TO HOLD