Separation component for a feeding bottle device

A baby bottle device comprising a separation component, the separation component providing a separation between a container space of the baby bottle device and a feeding space for providing liquid to an infant, the separation component comprising a hole wall portion surrounding a hole through the separation component for allowing a passage of fluid from the container space to the feeding space therethrough, the hole having a minimum cross-sectional area at a first state, wherein the minimum cross-sectional area is reduced at a second state with increasing pressure difference between the feeding space and the container space,

• wherein the hole wall portion comprises two walls opposite from each other and inclined with regard to a surrounding portion of the separation component, the two walls comprising end portions that are configured to move closer together at the second state, when a pressure of the feeding space side is lower than a pressure of the container space side, wherein the hole has a first dimension and a second dimension perpendicular to the first dimension, the first dimension being at most two times the second dimension.