Adjusted Age Calculator (Premature Infants)

What is Adjusted (Corrected) Age?

Adjusted age (or corrected age) is the age a premature baby would be if they had been born on their due date rather than their actual birth date.

How Does the Adjusted Age Calculator Work?

The calculation formula subtracts weeks of prematurity from chronological age: Adjusted Age = Chronological Age - (40 weeks - Gestational Age at Birth).

Step-by-Step Manual Calculation Walkthrough

• Step 1: Calculate Chronological Age using our Chronological Age Calculator.
• Step 2: Determine weeks of prematurity (40 weeks minus full gestational age at birth).
• Step 3: Subtract prematurity weeks from chronological age.

Edge Cases & Extreme Prematurity

For micro-preemies born before 28 weeks gestation, adjusted age is essential to prevent false diagnoses of developmental delay during early pediatric well-child visits.

Pediatric Guidelines & Discontinuation

American Academy of Pediatrics (AAP) guidelines recommend using corrected age until 24 months of age, after which most children catch up developmentally.

When Do You Need This Calculation?

• Developmental Milestones: Tracking motor skills (sitting, walking) against corrected norms.
• Growth Chart Plotting: Plotting WHO weight/height charts for premature infants.

How Adjusted Age Differs From Chronological & Biological Age

Adjusted age corrects for early birth, whereas Age Calculator measures calendar elapsed time, and Pregnancy Due Date Calculator tracks gestational timing.