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A micropenis refers to an unusually small penis. The condition is typically recognized shortly after birth, and is measured and diagnosed using certain criteria.
A micropenis is a penis that is at least 2.5 standard deviations smaller than the average human penis size. A penis that is smaller than 7 cm (2 3/4") when compared to the average which is 12.5 cm (5 in") is considered a micropenis. There are a variety of causes for the occurrence of a micropenis including in utero exposure to estrogen associated with some fertility drugs. The condition occurs in about 0.6% of males, and can be associated with other conditions of the reproductive system.