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Macrosomia refers to large body size. While it might be technically correct to refer to a large person as having or exhibiting macrosomia, it would sound pedantic. Macrosomia as it is used in pediatrics refers to the fetus and newborn. Most infants with macrosomia are infants of diabetic mothers, although of course some are just plain genetically big babies. Macrosomia is often given as the reason for caesarian section delivery. Obviously, the opposite of macrosomia is microsomia, which would be used in reference to an SGA baby.