Merck Manual

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Introduction to Growth and Development

By

Evan G. Graber

, DO, Nemours/Alfred I. duPont Hospital for Children

Reviewed/Revised Mar 2023
View PATIENT EDUCATION

Physical growth is an increase in size. Development is growth in function and capability. Both processes depend on genetic, nutritional, and environmental factors.

When describing physical and emotional development in children, it is useful to define certain age-based groups:

  • Neonate (newborn): Birth to 1 month

  • Infant: 1 month to 1 year

  • Young child: 1 year through 4 years

  • Older child: 5 years through 10 years

  • Adolescent: 11 years through 17 to 19 years

View PATIENT EDUCATION
NOTE: This is the Professional Version. CONSUMERS: View Consumer Version
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