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Find information on medical topics, symptoms, drugs, procedures, news and more, written for the health care professional.

* This is the Professional Version. *

Introduction to Growth and Development

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Patient Education

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

As children develop physiologically and emotionally, it is useful to define certain age-based groups. The following terminology is used:

  • Neonate (newborn): Birth to 1 mo

  • Infant: 1 mo to 1 yr

  • Young child: 1 yr through 4 yr

  • Older child: 5 yr through 10 yr

  • Adolescent: 11 yr through 17 to 19 yr

* This is the Professional Version. *