Our adjusted age calculator uses the standard pediatric formula to determine corrected age for premature infants. The calculation accounts for gestational age at birth and subtracts the weeks of prematurity from chronological age to provide accurate developmental assessment timing.

When to Use Adjusted Age

Adjusted age should be used for developmental and growth assessments but not for all purposes:

• Use Adjusted Age For: Developmental milestones (motor skills, language, social), growth charts (length, weight, head circumference), feeding and sleep schedules, pediatric assessments
• Use Chronological Age For: Immunization schedules (vaccines given by actual birth date), medication dosing and prescriptions, legal and administrative documents, daycare and school enrollment
• Duration: Most guidelines recommend correcting until 24 months adjusted age
• Individual Variation: Very premature babies may need correction beyond 24 months
• Medical Guidance: Always follow your pediatrician's specific recommendations

Sources & References