How to Use the Baby Corrected Age Calculator
Premature babies are born before their original due date, so measuring their age purely from the actual birth date can make them look developmentally behind compared to full-term peers. This calculator uses both the birth date and due date to show chronological age and corrected age side by side.
The math works by converting the gap between your due date and actual birth date into weeks, then subtracting that from the chronological age. For example, a baby born 4 weeks early will always have a corrected age that's 4 weeks younger than their chronological age. If the baby was born on or after the due date, no correction is applied.
This is a reference calculation only — always confirm developmental milestones, vaccination schedules, and any medical decisions with your pediatrician.
Frequently Asked Questions
Corrected age (also called adjusted age) is a baby's age calculated from their original due date instead of their actual birth date. It's used for premature babies because their development is better compared to peers at the same corrected age.
Pediatricians typically use corrected age for developmental assessments until around 24 months (2 years) of age. After that, chronological age is used. Always confirm the exact timing with your child's doctor.