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Humans are born too soon: impact on pediatric otolaryngology

Charles D Bluestone1

  • 1Department of Pediatric Otolaryngology, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh, 3705 Fifth Avenue, Pittsburgh, PA 15213, USA. bluecd@chp.edu

International Journal of Pediatric Otorhinolaryngology
|January 4, 2005
PubMed

Insights

Human gestation is 9 months, but evolutionary pressures suggest a 21-month term. This early birth impacts infant development and leads to various otolaryngology conditions, many of which resolve as the infant matures.

Area of Science:

  • Evolutionary biology
  • Human development
  • Otolaryngology

Background:

  • Human evolution has led to unique developmental challenges, including a prolonged gestation period that is evolutionarily advantageous for brain development but results in premature birth.
  • Premature birth in humans, compared to other primates, results in significant disadvantages and health issues.
  • The extended altriciality of human infants is a consequence of evolutionary trade-offs, particularly related to bipedalism and large brain size.

Purpose of the Study:

  • To explore the evolutionary hypothesis that humans are born prematurely.
  • To identify the impact of this early birth on diseases and disorders encountered in pediatric otolaryngology.
  • To understand the developmental trajectory of these conditions and their resolution in infancy.

Main Methods:

  • Comparative analysis of human gestation period with evolutionary pressures and primate development.
  • Review of common otolaryngologic conditions in infants, linking them to premature birth.
  • Correlation of disease resolution with infant immune system maturation and anatomical development.

Main Results:

  • Human gestation is proposed to be 12 months shorter than evolutionarily optimal (21 months).
  • Premature birth contributes to a range of otolaryngologic issues, including otitis media, laryngomalacia, and congenital nasal alar collapse.
  • Many of these conditions show improvement or complete resolution within the first year of life.

Conclusions:

  • Understanding the evolutionary basis of human birth timing is crucial for pediatric otolaryngology.
  • The propensity for certain infant disorders to resolve highlights the importance of maturation processes following early birth.
  • This evolutionary perspective aids in predicting patient outcomes for congenital otolaryngologic conditions.

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