Corrected Age Calculator
Estimate corrected age using birth date and due date, commonly used for preterm development tracking.
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Formula
The calculator estimates weeks early from due date and then adjusts chronological age to produce a corrected age estimate.
Worked Example
Why Corrected Age Matters for Premature Babies
- A baby born 8 weeks early at chronological age 6 months has a corrected age of 4 months
- Developmental milestones (sitting, crawling, first words) should be compared to corrected age, not chronological age, for preterm infants
- Most pediatricians use corrected age until the child is 2 to 3 years old, after which developmental differences typically resolve
- Corrected age is especially important for very preterm babies (born before 32 weeks) where the developmental gap is most significant
Always discuss milestone concerns with your pediatrician, who can provide personalized guidance based on your baby specific circumstances.
You can also calculate changes using our Gestational Age Calculator, Exact Age Calculator or Chronological Age by Date Calculator.
Frequently Asked Questions
How is corrected age calculated?
Corrected age equals chronological age minus the number of weeks the baby was born early. If your baby is 6 months old but was born 2 months early, their corrected age is 4 months.
Does this replace medical guidance?
No. Use this as an informational tool. Your pediatrician will use corrected age alongside other assessments to track your baby development appropriately.
When should I stop using corrected age?
Most healthcare providers recommend using corrected age until the child is 2 years old for general milestones, and up to 3 years for very premature babies. After that, most developmental differences have resolved.
Is corrected age used for school enrollment?
Generally no. Schools use chronological age (actual birth date) for enrollment. However, if prematurity significantly affected development, discuss options with your school district.
Does corrected age apply to full-term babies?
No. Corrected age only applies to babies born before 37 weeks gestation. Full-term babies (37+ weeks) use their chronological age for all milestone tracking.
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