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[burth-weyt] /ˈbɜrθˌweɪt/
the weight of an infant at birth.
Origin of birthweight Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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birth weight in Medicine

birth weight n.
In humans, the first weight of an infant, obtained within the first hour after birth. An infant of birth weight 5 1/2 pounds or more is considered full-sized.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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