Adjusted age, also called corrected age, is the age a preemie would be if he had been born on his due date. Adjusted ages are useful when evaluating a preemie's size and development. If a baby is 4 months old but was born 2 months early, for example, his weight and development may be closer to that of a 2-month-old baby.
When you are figuring out your baby's adjusted age, figure out about how many weeks or months early your baby was born, and subtract that number from his actual age.
A baby who was born 8 months ago and who was 6 weeks early at birth would have an adjusted age of 6.5 months. A baby who is 18 months old, but who was born 3 months early, would have an adjusted age of 15 months.
When gauging your child's development, you'll want to use your baby's adjusted age instead of his actual age until he turns 2 years old, or until his size and development catch up to what they should be if he had been born at term.
Learn More: When to Stop Using Adjusted Age