Preemie Adjusted Age Calculator
Accurate developmental tracking for premature babies
Corrected age is used for babies born before 37 weeks to track physiological development and milestones accurately.
Chronological Age
(Actual time since birth)
Adjusted Age
(Developmental Body Age)
If a baby is born prematurely, developmental milestones—like crawling or smiling—should be tracked using Adjusted Age. This is the age the baby would be if they were born on their original due date. This prevents parents from worrying about "delays" that are actually biologically on track.
For example, if a 6-month-old was born 2 months early, their adjusted age is 4 months. Use this tool until your child reaches age 2, then switch to the Standard Age Calculator. You can also find their very first Half-Birthday using their actual birth date for celebration.