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Dr. Jennifer Gunter

Q&A: What's the Difference Between Actual Age and "Adjusted" Age?

What's the difference between actual age and "adjusted" age in preemies?

“Actual age” is your baby’s real age, calculated from her birthday; while adjusted age is calculated from her due date. A baby needs a full 40 weeks (give or take a week) to grow and develop, so the adjusted age takes into account the weeks of pregnancy that are missed due to a premature delivery. For example, consider a baby born at 28 weeks who is now 16 weeks old by actual age and 4 weeks by adjusted age. This baby, technically four months from her birthday, is not expected to have met the same developmental milestones as a four-month-old. Instead, this baby will be more on track with a baby who is one month old.

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