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Related Experiment Videos

Gender differences at birth and differences in fetal growth.

M A Crawford1, W Doyle, N Meadows

  • 1Nuffield Laboratory of Comparative Medicine, Institute of Zoology, London, UK.

Human Reproduction (Oxford, England)
|August 1, 1987
PubMed
Summary

Sex differences in fetal development, including birth weight and length, suggest a sexual bias in fetal metabolism and physiology. This bias may influence implantation, growth, and survival rates, potentially involving lipid metabolism.

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Area of Science:

  • Reproductive Biology
  • Developmental Physiology
  • Human Sex Differences

Background:

  • Observed discrepancies in birth numbers between sexes suggest natural selection based on survival.
  • Known adult metabolic and physiological sex differences prompt investigation into fetal development.
  • Anthropometric variations (weight, length, head circumference) exist between male and female newborns, unlike placental weight.

Purpose of the Study:

  • To explore the hypothesis that sexual bias in fetal metabolism and physiology underlies observed anthropometric differences at birth.
  • To investigate the potential role of fetal metabolic and physiological sexual dimorphism in implantation, growth, and survival to birth.
  • To identify specific physiological components, such as lipid metabolism, that may contribute to sex-based developmental differences.

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Main Methods:

  • Review and interpretation of existing data on sex-based discrepancies in birth anthropometry.
  • Analysis of the relationship between fetal sex, metabolic/physiological characteristics, and survival rates.
  • Consideration of experimental data and theoretical models regarding sex ratio manipulation and physiological factors.

Main Results:

  • Anthropometric differences at birth (weight, length, head circumference) between sexes indicate a sexual bias in fetal development.
  • Placental weight shows less pronounced sex bias compared to fetal anthropometrics.
  • The proposed sexual bias in fetal metabolism and physiology is considered essential for achieving observed anthropometric differences.

Conclusions:

  • Fetal metabolic and physiological sexual dimorphism is likely responsible for anthropometric variations observed at birth.
  • This sexual bias influences the efficiency of implantation, fetal growth, and ultimately, survival rates to birth.
  • Lipid metabolism is a strong candidate for the primary physiological component mediating these sex-based developmental differences.