Ava's mum told me about this bottle which they used for her when she started having difficulty feeding, due to her underlying neurological problems.
The Haberman Feeder is a speciality bottle for babies with impaired sucking ability.
The feeder's design enables the feeder to be activated by tongue and gum pressure, imitating the mechanics involved in breastfeeding, rather than by sucking.
Before starting the feeding, air is squeezed out of the nipple and is automatically replaced by milk through a one way valve. Milk cannot flow back into the bottle and is replenished continuously as the baby feeds. A slit valve opening near the tip of the nipple shuts between jaw compressions, preventing the baby from being overwhelmed with milk.
For infants who need assistance with their feeding efforts, mother (or whoever is feeding the baby) may apply a gentle pumping action to the body of the nipple.