occurring during or pertaining to the phase surrounding the time of birth, from the twentieth week of gestation to the twenty-eighth day of newborn life.

1950–55; peri- + natal

perinatally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perinatal (ˌpɛrɪˈneɪtəl)
of, relating to, or occurring in the period from about three months before to one month after birth

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

perinatal per·i·na·tal (pěr'ə-nāt'l)
Of, relating to, or being the period around childbirth, especially the five months before and one month after birth.

per'i·na'tal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Other studies show that proper birth spacing, for which contraception is an effective tool, leads to better perinatal outcomes.
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