In plain words
An intraoral vacuum is the negative pressure a baby makes in the mouth during breastfeeding. The baby seals the lips around the breast and lowers the tongue. The space in the mouth grows, the pressure drops, and milk is drawn from the breast. Ultrasound research shows this vacuum, more than squeezing alone, moves most of the milk. A good seal and a tongue that can drop are important for it. That is why latch, tongue movement, and tissue restrictions come up in feeding care. A baby who cannot make a strong vacuum may take less milk and tire quickly. Mothers may notice clicking, slipping, or long feeds. A can watch a feed and show how the seal is working.
The deeper version
Ultrasound studies by Geddes and colleagues (Early Human Development, 2008) show that milk removal is driven primarily by intraoral vacuum generated during tongue descent, rather than by peristaltic stripping alone. The vacuum depends on a seal at the lips and on the posterior tongue's movement against the palate. Tongue elevation and lowering create cyclic negative and positive pressure. Disruption of the seal or of tongue movement, from oral anatomy or positioning, reduces . Intraoral pressure is measured in research with transducers, while clinical assessment relies on observation. How much individual variation in vacuum affects weight gain and breastfeeding duration in routine care remains uncertain.
Where it comes up
- Getting a deep latchFeeding Your Baby
- Nipple pain, cracks, and healingPostpartum: Your Body
- Tongue and lip tiesFeeding Your Baby
What mothers here say about intraoral vacuum
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Sources
- Geddes DT, Kent JC, Mitoulas LR, Hartmann PE — Tongue movement and intraoral vacuum in breastfeeding infants. Early Human Development, 2008