Original article
Fetal phallic growth and penile standards for newborn male infants

https://doi.org/10.1016/S0022-3476(75)80969-3Get rights and content

No appreciable difference in size of the fetal clitoris versus the fetal penis was noted until 14 weeks gestation, which is after the period of masculine differentiation of the extermal genitals. However, significant differences in the rate of penile and clitoral growth were evident in second trimester fetuses. The majority of the prenatal growth of the penis occurs after 14 weeks gestation at an almost linear rate. The penile stretched length of the full-term infant was 3.5 cm±0.7 cm and the diameter was 1.1 cm±0.2 cm.

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Supported by Maternal and Child Health Services, Health Services and Mental Administration, Department of Health, Education, and Welfare, Project 913, National Institutes of Health Grant HD 05961, Public Health Service Grant GM 15253, and The National Foundation—March of Dimes.

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