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Prematurity or immaturity?

P J Steer1

  • 1Division of Surgery, Oncology, Reproductive Biology and Anaesthetics, Faculty of Medicine, Imperial College London, London, UK. p.steer@imperial.ac.uk

BJOG : an International Journal of Obstetrics and Gynaecology
|January 9, 2007
PubMed
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Human childbirth is challenging due to bipedalism and increasing fetal head size. Preterm birth in Black African babies, while common, shows lower mortality rates compared to White European babies, suggesting an evolutionary adaptation.

Area of Science:

  • Human evolutionary biology
  • Obstetrics and Gynecology
  • Perinatal medicine

Background:

  • Human birth is uniquely difficult among primates due to the evolution of bipedalism, resulting in a smaller pelvis.
  • Increasing fetal head size in recent millennia exacerbates childbirth difficulties, with potential conflicts of interest between mother and fetus regarding birth weight.
  • Obstructed labor contributes significantly to maternal mortality worldwide, particularly in Africa, and is linked to higher rates of cesarean sections in certain populations.

Purpose of the Study:

  • To investigate the differences in birth timing and outcomes between Black African and White European babies.
  • To explore the potential evolutionary implications of preterm birth in response to pelvic-fetal disproportion.

Main Methods:

  • Analysis of a 13-year birth study in North West Thames.

Related Experiment Videos

  • Comparison of gestational age, birth weight, and perinatal outcomes between Black African and White European infants.

    • Main Results:

    • Black African babies were significantly more likely to be born preterm (24-31 weeks) than White European babies.
    • Between 33-38 weeks gestation, Black African babies exhibited more mature behaviors and higher rates of meconium passage and jaundice, but fewer respiratory issues requiring special care.
    • Preterm Black African babies had lower gestation-specific perinatal mortality rates than their White European counterparts, though this reversed at term and beyond.

    Conclusions:

    • Preterm birth may represent an evolved mechanism to mitigate complications arising from cephalopelvic disproportion in human birth.
    • Observed differences in preterm birth rates and outcomes between ethnic groups warrant further investigation into their underlying biological and socio-environmental factors.