What is micropenis?

Micropenis is defined as a normally structured penis that is below the normal size range for an infant. Normally, the length of a newborn boy's penis is between 2.8 to 4.2 centimeters with a circumference of 0.9 to 1.3 centimeters. This measurement is taken by carefully stretching the penis and measuring from the tip of the penis to the base of the penis. A penis length of less than 1.9 centimeters is usually considered micropenis.

What causes micropenis?

The cause of micropenis is not known in most cases. Micropenis can occur alone, but may also occur in combination with other disorders. Hormone disorders that cause an abnormally low level of hormones which are involved in development of the sexual organs may be associated with micropenis. This can also involve the pituitary gland or the hypothalamus.

How is micropenis diagnosed?

Diagnosis is made by physical examination. Your child may then be referred to several specialists including a pediatric urologistand a pediatric endocrinologist (a physician who specializes in hormones).

Treatment for micropenis:

Specific treatment for micropenis will be determined by your child's physician based on:

  • Your child's age, overall health, and medical history
  • The extent of the condition
  • Your child's tolerance for specific medications, procedures, or therapies
  • Expectations for the course of the condition
  • Your opinion or preference

There is no cure for micropenis. Hormone therapy may be indicated for some children to stimulate penile growth.