Age Group
newborn Audio
new·born [ noo-bawrn, nyoo- ]
Definitions related to infant, newborn:
  • (newborn) An age group comprised of infants during the first month after birth.
    NCI
    U.S. National Cancer Institute, 2021
  • (neonate) Human body from birth to 4 weeks.
    Foundational Model of Anatomy
    University of Washington, 2017
  • An infant during the first 28 days after birth.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • (newborn human (0-6 weeks)) An infant human from birth through 6 weeks of age; also index with appropriate human and clinical research terms.
    CRISP Thesaurus
    National Institutes of Health, 2006
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.