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How to Calculate the Adjusted Age for Prematurity

author image Melissa Scholten-Gutierrez
Melissa Scholten-Gutierrez has been writing articles about health and wellness topics since 2008. She contributes to LIVESTRONG.COM, offering experience in a variety of physical and behavioral health venues, and specializing in women's health and behavioral therapies. She graduated with a Master of Social Work with a concentration in health care from the University of Illinois at Urbana-Champaign.
How to Calculate the Adjusted Age for Prematurity
Baby in an incubator. Photo Credit: metin Kiyak/iStock/Getty Images

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."

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Step 1

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

Step 2

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

Step 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.

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