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The Simpson–Golabi–Behmel syndrome (SGBS) is an overgrowth condition comprising “coarseness” of facial traits, supernumerary nipples, congenital heart defects, polydactyly and fingernail hypoplasia, and an increased risk of neonatal death and later neoplasia. Psychomotor development is usually normal. The syndrome is caused by mutation/deletion of the X‐linked gene GPC3. We describe a new case of...