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A disease trait defined as a stretched penile length of less than 2.5 standard deviations below the mean for age. Traditionally, the term micropenis refers to a penis that is otherwise normally formed. The term microphallus is used when associated hypospadias is present. The mean stretched penile length in a full-term newborn male is 3.5 cm. Measurements of less than 2-2.5 cm in a full-term newborn male meet the definition of micropenis.