<prompt> Neonatal period extends up to:21 days of life30 days of life28 days of life35 days of life  <response>: c. 28 days of lifeRef: Nelsons 20e p 789-791, Ghai 8e p 124-125Neonatal period extends from birth to under 4 weeks 28 days of age, of which early neonatal period refers to 1st week of life 7 days 