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Update of growth percentiles for infants born in an Australian population

R L Guaran1, P Wein, M Sheedy

  • 1Mercy Hospital for Women, East Melbourne, Victoria, Australia.

Insights

Newborn growth charts need regular updates due to population changes. This study found that infant sex and maternal ethnicity, specifically South-East Asian origin, impact birth weight percentiles, requiring localized standards.

Area of Science:

  • Perinatology
  • Pediatric Growth Standards
  • Public Health

Background:

  • Established growth percentiles necessitate periodic revision to reflect evolving population demographics and socioeconomic influences.
  • Accurate anthropometric data is crucial for monitoring infant health and development.

Purpose of the Study:

  • To derive updated birth-weight percentiles for newborns, considering infant sex and maternal ethnicity.
  • To compare new growth data with existing intrauterine growth curves.
  • To highlight the need for localized growth standards.

Main Methods:

  • Analysis of anthropometric measurements from 49,429 singleton livebirths (1980-1989) at Mercy Hospital for Women, Melbourne.
  • Derivation of birth-weight percentiles for the general study group, separately for males and females, and for infants of South-East Asian mothers.
  • Preparation of percentile charts for length, head circumference, and ponderal index.

Main Results:

  • Generally elevated birth-weight percentiles compared to previous intrauterine growth curves.
  • Male infants exhibited larger birth weights than female infants.
  • Infants of South-East Asian mothers were smaller on average, though 10th percentile birth weights showed similarity from 36-39 weeks gestation.

Conclusions:

  • Local newborn growth standards require periodic review and updating.
  • Infant sex and maternal ethnic origin are significant factors influencing birth weight and growth characteristics.
  • Consideration of these factors is essential for accurate categorization of newborn growth.

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