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Date: | Mon, 12 Dec 2005 11:17:52 -0500 |
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Awhile ago, someone on Lactnet questioned how hand expression works when
the recent ultrasound research has suggested that negative pressure is
the most efficient way to get milk out of the breast.
It has been believed for quite some time that babies modulate positive
and negative pressure to remove milk from the breast. It would be
impossible for infants with cleft palates to get any milk from the
breast if negative pressure were the only possible player. (Some
cleft-affected infants indeed don't transfer milk, but some do transfer
at least some).
Manual expression uses positive pressure to increase the pressure inside
the breast, and make milk flow outward in an attempt to equalize
pressure inside and outside.
Catherine Watson Genna, IBCLC NYC
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