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Age and Development

When babies are born prematurely (less than 37 weeks of pregnancy,) many parents, care givers and care providers are not sure if they should use the baby’s chronological age or corrected age to assess growth and development, feeding, and time to immunize.

Chronological Age

Chronological age is used to describe the actual age of the baby, based on their birthday. For example, a baby born September 15 is chronologically three months on December 15.

Chronological age is used for giving immunizations (just like full term babies).

Corrected Age (for prematurity)

Corrected Age (for prematurity) is the age the baby would be, if the baby had not been born early. For example, if the baby was born on September 15 but the due date was November 15, the baby’s corrected age on December 15 would be one month (chronological age is three months).

Corrected age is used for assessing growth, development (rolling over, walking, talking etc.) and feeding (introduction of solid foods, etc.).

In our clinic, we correct the age for all babies born at less than 37 weeks of pregnancy until the child is 2 years old.

For more information on babies born prematurely, check out the following links:  


Updated Jul 18, 2014