Corrected age
Use corrected age for growth and milestones until about 2 years. Vaccinations follow your baby’s actual age.
What is corrected age?
Corrected age (also called adjusted age) is your baby’s age counted from their original due date instead of their birth date. It reflects their stage of development more accurately than actual age when they were born before 37 weeks.
How it is calculated
The calculator works out how many weeks early your baby was born (40 weeks minus their gestational age at birth), finds the original due date, and counts your baby’s age from that date. For example, a baby born at 32 weeks is 8 weeks early; at 6 months old, their corrected age is about 4 months.
When to use corrected age
- Plotting growth on charts
- Checking developmental milestones
- Deciding when to start solid foods, together with readiness signs
Doctors usually use corrected age until about 2 years. Vaccinations are given according to actual age.
Frequently asked questions
Until what age should I use corrected age?
Most doctors use it until about 2 years, when most premature babies have caught up. Your baby’s doctor may advise differently.
Do vaccines follow corrected age?
No. Vaccines are usually given by actual age, unless your doctor advises otherwise.
Is my information saved?
No. The calculation runs in your browser and nothing is stored.