Teats come in different flows and shapes. Commonly, they are designed to be in a 'natural' shape, one that mimics a nipple. This allows the baby to switch from breastfeeding to bottle feeding at ease, preventing nipple confusion. As your baby feeds more, you will need to switch to bigger bottles and teats that provide faster flow. Shop a different variety of teats from slow, medium, fast, and even variflow to suit your baby's needs. Like bottles, these teats will also need to be sterilized after each use to prevent bacteria growth.