postneonatal
adjective
post·neo·na·tal
ˌpōst-ˌnē-ō-ˈnā-tᵊl
medical
: 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
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Merriam-Webster unabridged
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