Corrected Age:

Corrected age is determined by subtracting the number of weeks premature from the infant's chronological age.

Corrected age = Chronological age - number of weeks premature

LH was born at 27 weeks gestation and is now 3 years (or 36 months or 156 weeks) past her date of birth:

Step 1. 40 weeks - 27 weeks = 13 weeks, or 3 months, 1 week premature.

Step 2. corrected age = 156 weeks - 13 weeks = 143 weeks corrected age (33 months or 2 years, 9 months)

or

Step 2. corrected age = 36 months - 3 months = 33 months corrected age