Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 8/28/2025

Growth Assessment for a 12-Year-Old Girl

Height and Weight Assessment

  • A 12-year-old girl with a height of 150.3 cm and weight of 42.25 kg falls approximately between the 50th and 75th centiles for both height and weight, according to the UK WHO growth charts 1
  • The weight of 42.25 kg for a 12-year-old girl is appropriate for her height, indicating a balanced growth pattern 2
  • The normal weight range for girls this age is approximately 40-45 kg at the 50th centile, placing her weight in the normal range 1

BMI Assessment

  • Calculating her BMI: 42.25 kg ÷ (1.503 m)² = 18.7 kg/m², which falls within the normal range (between 18.5-24.99 kg/m²) for her age 3, 4
  • A BMI of 18.7 kg/m² for a 12-year-old girl indicates appropriate weight for height without evidence of underweight or overweight status 2

Clinical Interpretation and Monitoring

  • The combination of height and weight both falling between the 50th and 75th centiles suggests a healthy, proportional growth pattern 1
  • Growth velocity is as important as the absolute measurements; serial measurements over time provide more valuable information about growth patterns than single measurements 3
  • Parental heights should be considered when interpreting growth charts to account for genetic potential 3
  • Continue regular growth monitoring every 6-12 months to ensure maintenance of appropriate growth trajectory 3
  • Plot measurements on growth charts to visualize the growth pattern over time 3

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