Corrected & Chronological Age



When a baby is born before their due date, they will have two ages: their corrected age and their chronological age. Your baby also had a gestational age, which was the age of your baby from conception to birth, calculated in weeks.

When following your baby’s growth and development, it can be helpful to know the difference between the ages:

Corrected age: The age your baby would be if they had been born on their due date. For example, a baby who was born three months early (who now has a chronological age of seven months) has a corrected age of four months. Corrected age is useful while following your baby’s growth and development.

Chronological age: The age of your baby since birth. Your child's birthdays are celebrations of his or her chronological age.
To calculate your baby’s corrected age, start with your baby’s age in weeks (the number of weeks since birth) and subtract the number of weeks your baby was premature.

For example, Eli was born at 25 weeks gestation (15 weeks early) and 27 weeks have passed since his birth. His corrected age is 27 weeks - 15 weeks = 12 weeks or three months corrected.

For most pre-term babies, you will only need to correct their age until they are two or three years, as by this time most children have caught up developmentally to their peers.

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Disclaimer: This publication by Miracle Babies Foundation is intended solely for general education and assistance and it is it is not medical advice or a healthcare recommendation. It should not be used for the purpose of medical diagnosis or treatment for any individual condition. This publication has been developed by our Parent Advisory Team (all who are parents of premature and sick babies) and has been reviewed and approved by a Clinical Advisory Team. This publication is not a substitute for professional medical advice. Miracle Babies Foundation recommends that professional medical advice and services be sought out from a qualified healthcare provider familiar with your personal circumstances.To the extent permitted by law, Miracle Babies Foundation excludes and disclaims any liability of any kind (directly or indirectly arising) to any reader of this publication who acts or does not act in reliance wholly or partly on the content of this general publication. If you would like to provide any feedback on the information please email [email protected].