neonate (n.), neonatal (adj.)

https://doi.org/10.1351/goldbook.10997

Newborn animal or human infant during the first four weeks of postnatal life.

Note: For statistical purposes, some scientists have defined the period as the first seven days of human postnatal life. The precise definition varies from species to species.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 783 [Terms] [Paper]
Citation: 'neonate' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.10997 RIS BibTex EndNote
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