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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.



Blickstein I, Perlman S, Hazon Y, et al. Diabetes mellitus during pregnancy. In: Martin RJ, Fanaroff AA, Walsh MC, eds. Fanaroff and Martin's Neonatal-Perinatal Medicine. 10th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 19.

Ramos GA, Moore TR. Endocrine disorders in pregnancy. In: Gleason CA, Devaskar SU, eds. Avery's Diseases of the Newborn. 9th ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 9.

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Review Date 11/19/2015

Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.