Adjusted Age Calculator
Calculate corrected age for preterm infants using gestational age or due date method.
What Is Adjusted Age?
Adjusted age (corrected age) accounts for prematurity when tracking infant development. It is recommended by AAP and CDC until about 24 months. Related: Gestational Age Calculator.
Adjusted Age Formula
$$\text{adjusted age} = \text{chronological age} - (280 - \text{gestational days at birth})$$
Frequently Asked Questions
When should I stop using adjusted age?
Most clinicians switch to chronological age after 24 months corrected age.
What is full-term gestation?
40 weeks, or 280 days, is the standard full-term reference.
Can I use due date instead of gestational age?
Yes. The difference between due date and birth date equals the prematurity correction.
Why report 18- and 22-month dates?
These milestones are common developmental checkpoints for preterm follow-up.
Does this replace pediatric assessment?
No. Always discuss growth and development with your pediatrician.
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