Adjusted Age

How to Figure Your Multiples' Adjusted Age

Baby twins (3-6 months) sitting on mothers lap
Twins Adjusted Age. undefined

Some twins and multiples are born prematurely. When babies are born early, they may not develop according to the standard schedule of milestones, as it is established based on babies born closer to their due date. A typical gestation lasts forty weeks, but twins or multiples may arrive several weeks, or even months, earlier. Parents of multiples may refer to their babies adjusted age as more representative of their status than their actual age.

(Sometimes the term "corrected age" is used in place of adjusted age, and the term "chronological age" is used to describe actual age.) Depending on the degree of their prematurity, adjusted age may provide a more accurate assessment for the first few months, or even the first few years of their lives.

What is Adjusted Age?

Adjusted age reflects the difference between a baby’s actual -- chronological -- age based on their birth date, and the baby’s due date. To determine adjusted age, subtract the number of weeks he or she was born early from his or her current age.

Actual Age in Weeks - # of Weeks Early = Adjusted Age

For example, twins who are 11 weeks old, but were born at 34 weeks, have an adjusted age of five weeks. Babies who are six months old, but were born a month early, have an adjusted age of five months. Adjusted age can be configured in weeks or months, depending on what makes the most sense.

It may be helpful to utilize adjusted age when assessing milestones, such as teething, talking or crawling. Most children catch up to their peers within the first few years and adjusted age is no longer relevant, but consult your pediatrician or medical provider for information specific to your family.

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