TheDr Brown's Narrow Options+ Preemie Bottle has been proved to aid premature newborns with a poor sucking reflex who struggle to compete with the vacuum created by unvented bottles. It can also help with the transition of babies from Nasogastric Tube to Normalized Eating, allowing parents to feel more connected to their preterm baby's feeding.
The bottle's positive action does not preclude breast feeding and has been proved anecdotally to assist the Breast & Bottle mixed feeding strategy. Professionals in the medical field recommend it.