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How to Calculate the Adjusted Age for Prematurity

By Melissa Scholten-Gutierrez ; Updated July 18, 2017

The March of Dimes states that one in eight pregnant women will give birth too early, equating to about 500,000 premature babies every year. When your child is born prematurely you may need to know both its chonological age and adjusted age. Health care providers will often used the adjusted age when assessing the baby's growth and development to see if it is "catching up."

  1. Determine your baby's chronological age and how many weeks premature he was born.

  2. Subtract the number of weeks premature your baby was from her chronological age. This is her adjusted age in weeks.

  3. Divide your baby's adjusted age in weeks by four to determine his adjusted age in months. As an example, if your child is 18 weeks old currently and was six weeks early, his adjusted age is 12 weeks, or three months.

  4. Tip

    Check with your health care providers to see if they prefer using adjusted or chronological ages.

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