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Macrosomia describes an unusually large body size. It is often used to describe an oversized fetus.


The most common cause of macrosomia is diabetes in the mother. Macrosomia can lead to trauma during birth and a greater chance of a cesarean delivery.

Review Date: 11/13/2011
Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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