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Macrosomia refers to a very 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 injury during birth and a greater chance of a Cesarean delivery.



Langer O. Pregnancy complicated by diabetes mellitus. In: Martin RJ, Fanaroff AA, Walsh MC, eds. Fanaroff and Martin's Neonatal-Perinatal Medicine. 9th ed. St. Louis, MO: Elsevier Mosby; 2010:chap 16.

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Update Date 12/4/2013