Knowing your premature baby's two ages will help you and your doctor more effectively track his development.

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Chronological age is your baby's age from his actual date of birth.

Corrected age (also known as adjusted age) is based on your baby’s due date. Simply subtract from his chronological age the number of weeks early he was born. For example, a 10-week-old who was born 8 weeks early has a corrected age of two weeks old.

Why does it matter?
Your preemie might experience developmental milestones differently than full-term babies, accomplishing things closer to his corrected age.

In order to evaluate your baby’s development and compare it to other children his age, his doctor might track his corrected age for a year or more.

Find your Corrected Age Calculator.