Panic and choking may result. The Haberman feeder has a slit valve in the mouthpiece that only opens when the baby sucks. You baby has complete control and is not overwhelmed. The nipple allows for a variable opening, that is adjusted by positioning the bottle in the baby's mouth. Many babies swallow air while feeding.
Excessive air is swallowed on the next suck.
The Haberman feeder has a special inlet groove that allows air back in, relieving the vacuum pressure. If you baby needs additional help feeding, you can gently squeeze and release the reservoir of the teat. This will deliver a controlled amount of milk into your baby's mouth. The teat is a variable flow nipple, with gradation marks that align with the slit, by gently rotating the nipple you can increase or decrease the flow rate. Do not turn the teat inside out or force brushes through the slit.