Calculator
Corrected age calculator for babies born early
Was your baby born early? Two quick questions tell you which age to use for milestones, what most babies do at that age, and which checklist fits.
Free from Oaklin Lane’s therapists. Nothing here is a diagnosis, and if something feels off, that’s enough to ask.
How it works
Enter your baby’s birthday, then tell us how early they arrived. You can pick the number of weeks early or enter their original due date. We subtract the time they arrived early from their calendar age. What’s left is their corrected age, sometimes called adjusted age.
Why corrected age matters
A baby born eight weeks early has had eight fewer weeks to grow before birth. Comparing them with babies born on their due date isn’t fair to them, or to you. Pediatricians and therapists use corrected age for milestones until about age two, when most kids born early have caught up.
What you’ll see
- The age to use when you look at milestones
- A simple picture of calendar age versus corrected age
- What most babies do around that age, from the CDC’s milestone lists
- The right milestone checklist to try next, plus a one-page printout for your pediatrician
If your baby spent time in the NICU, ask your pediatrician about developmental follow-up. Early support for feeding, movement and speech makes a real difference.
A calculator, not medical advice. Your baby’s care team may adjust for prematurity differently.
Questions families ask
Until what age should I use corrected age?
Most care teams use corrected age until a child turns two. After that, most kids born early have caught up, and their real age is used.
What counts as premature?
Babies born before 37 weeks of pregnancy are considered premature. Full term is about 40 weeks.
My baby was born at 36 weeks. Does that matter?
Four weeks makes a noticeable difference in the first year. Using corrected age helps you compare your baby fairly.
Do you see babies who were born early?
Yes. Our Lake Highlands and Rockwall clinics see babies from birth for feeding, physical, occupational and speech therapy, including NICU graduates.
