transition period
Critical first hours after birth when newborns adapt from intrauterine to extrauterine life.
Full Definition
The transition period refers to the first 6-12 hours after birth during which newborns undergo complex physiological adaptations from intrauterine to extrauterine life. This period involves major changes in cardiovascular, respiratory, and thermoregulatory systems, including closure of fetal circulatory shunts, establishment of independent breathing, and activation of metabolic processes. During this time, newborns may experience temporary difficulties such as irregular breathing patterns, temperature instability, or feeding challenges. Close monitoring is essential as complications during the transition period can indicate serious underlying problems. Successful transition is marked by stable vital signs, effective breathing, and appropriate behavioral responses.
Usage
Usage note: Hyphenate when used as an adjective (transition-period complications).
In Context
- "The infant experienced a smooth transition period with stable vital signs and spontaneous breathing." — newborn assessment
- "Complications during the transition period may require extended monitoring in the nursery." — clinical guideline