It is important to use the flow speed that suits the stage your baby has reached.
Newborn or Slow-Flow has a single hole to control the flow at a safe rate for you new baby and encourage vigorous sucking.
Medium-Flow provides a steady flow for babies with a faster sucking action.
Fast-Flow has four holes and is for babies who suck more vigorously.
VariFlow allows your baby's sucking action to control the rate of flow. You can change it to suit your baby or to vary the speed during the feed.