Micropenis

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 (1.1 to 1.6 inches) with a circumference of 0.9 to 1.3 centimeters (0.35 to 0.5 inches). 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 (0.75 inches) is usually considered micropenis.

Prevention & Risk Assessment

Prevention & Risk Assessment

What causes micropenis?

Micropenis can occur alone, but usually occurs in combination with other disorders. Hormone disorders that cause an abnormal level of the hormones involved in the development of the sexual organs may be seen in combination with micropenis. This can involve the pituitary gland or the hypothalamus.

What are the symptoms of micropenis?

While each child may experience symptoms differently, the most common finding with micropenis is an infant penis size that is less than 1.9 centimeters when stretched gently. In some cases, low sperm count, resulting in infertility or decreased fertility, is found in adulthood. Micropenis may or may not be seen in conjunction with other disorders. Always consult your child's doctor for a diagnosis.

Diagnosis

Diagnosis

How is micropenis diagnosed?

Diagnosis is usually made by physical examination. Your child may then be referred to several specialists including a pediatric urologist (a doctor who specializes in disorders and care of the urinary tract and the male genital tract) and a pediatric endocrinologist (a doctor who specializes in hormones).

Treatments

Treatments

What is the treatment for micropenis?

Specific treatment for micropenis will be determined by your child's doctor 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. Other treatment options will be discussed with you.

Children's Team

Children's Team

Providers

Departments

Departments

Endocrinology and Diabetes

The Division of Endocrinology and Diabetes at Children's National Health System is the largest endocrinology program in the mid-Atlantic region. When you entrust your child's care our specialists, you can be assured that leading experts in the field are helping your child.

Urology

At Children’s National in Washington, DC, our pediatric urologists provide comprehensive care for disorders affecting reproductive and urinary organs.

Invest in future cures for some of life's most devastating diseases

See other ways to give

Keep in touch with Children's National by signing up for our newsletters.

Sign up now

Catherine's Story

Patient story

"Don't be afraid to talk to other parents and to reach out to them, no matter what condition their child has. It is this connection with other parents that will make your journey easier." 

Read More of Catherine's Story