post·​neo·​na·​tal ˌpōst-ˌnē-ō-ˈnā-tᵊl How to pronounce postneonatal (audio)
: of, relating to, or affecting the human infant during the period between approximately the first month after birth and the end of the first year of life
postneonatal mortality
the postneonatal stage

Example Sentences

Recent Examples on the Web Differences in postneonatal mortality, or from one month to one year, however, were much more stark. Aaron E. Carroll, New York Times, 6 June 2016

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'postneonatal.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1940, in the meaning defined above

Time Traveler
The first known use of postneonatal was in 1940

Dictionary Entries Near postneonatal

Cite this Entry

“Postneonatal.” Dictionary, Merriam-Webster, Accessed 4 Jun. 2023.

Medical Definition


post·​neo·​na·​tal -ˌnē-ō-ˈnāt-ᵊl How to pronounce postneonatal (audio)
: of, relating to, or affecting the infant and especially the human infant usually from the end of the first month to a year after birth
postneonatal mortality
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