Help train your baby switch from bottles to sippers in his early development years with Avent Bottle to Cup Trainer, SCF251/00. The nipple can be replaced with the sipper that gives a familiar bottle like comfort. Its soft nipple is made in accordance to the right amount of flow that suits for your baby. The petals inside the nipple increases the flexibility and reduces the chances of discomfort. This protects baby's digestive system by letting the air flow out instead of letting it in your baby's stomach. The detachable trainer handle has a unique gripping design to hold easily.