Thanks to the new valve, liquid only flows out of the cup when your baby is drinking. Repourse, spillage or overturning are no longer a problem, nothing runs out. The beak cup is very bite resistant and makes easy drinking child's play. Thanks to its non-slip structure and ergonomic shape, your child can hold the cup perfectly and quickly learns to drink on its own. Compatible with Philips Avent natural and classic+ bottles (except glass bottles) and all other cups (except adult drinking cups). The cups can be combined.