1. What is Adjusted Age?

Adjusted age (or corrected age) is a calculation used for preterm infants to account for their early birth. It represents how old the baby would be if born at 40 weeks gestation. This adjustment is important for proper developmental assessment.

2. How Does the Calculator Work?

The calculator uses the NICHD adjusted age formula:

Where:

• Chronological Age — Actual age since birth (weeks)
• Gestational Age — Weeks of gestation at birth (22-40 weeks)
• 40 — Full term gestation in weeks

Explanation: The formula subtracts the weeks of prematurity (40 - gestational age) from the chronological age to determine developmental expectations.

3. Importance of Adjusted Age

Details: Adjusted age is crucial for evaluating growth and development in preterm infants. Most experts recommend using adjusted age until 2-3 years for developmental assessments.

4. Using the Calculator

Tips: Enter chronological age in weeks since birth and gestational age at birth in weeks (22-40 weeks). The calculator will compute the adjusted age in weeks.

5. Frequently Asked Questions (FAQ)

Q1: Until what age should adjusted age be used?
A: Typically until 2-3 years chronological age, though this may vary based on degree of prematurity and individual circumstances.

Q2: How does adjusted age affect developmental milestones?
A: Milestones should be assessed based on adjusted age, not chronological age, especially in the first 2 years.

Q3: When should I stop using adjusted age?
A: Most children "catch up" by age 2-3, but consult your pediatrician for guidance specific to your child.

Q4: Does adjusted age affect vaccination schedules?
A: No, vaccinations should be given based on chronological age, not adjusted age.

Q5: How does this differ for extremely preterm infants?
A: Extremely preterm infants (<28 weeks) may need longer adjustment periods and specialized assessments.