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.
Micropenis can occur alone, but usually occurs along 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.
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 along with other disorders. Always consult your child's doctor for a diagnosis.
Diagnosis is usually made by physical exam. 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).
Your baby’s health care provider will figure out the best treatment for your baby based on:
How old your baby is
His or her overall health and medical history
How well you/your baby can handle specific medications, procedures, or therapies
How long the condition is expected to last
Your opinion or preference
There is no cure for micropenis. Hormone therapy may be used for some children to stimulate penile growth. Other treatment options will be discussed with you.