1. It encourages the sucking action which is important for current jaw development. To help with the birthing process, all babies are born with under-developed jaws. The mouth, tongue and jaw muscles are then developed by the natural sucking action used in breast-feeding, which makes the baby ?work? for his feed. By developing these muscles correctly, there will be sufficient space for correct development of the teeth. It is this natural sucking action that the NUK teat mimics, so feeding from a NUK teat will encourage healthy oral development.