Ambiguous genitalia is a rare condition in which an infant's external genitals don't appear to be clearly either male or female. In a baby with ambiguous genitalia, the genitals may not be well-formed or the baby may have characteristics of both sexes. The external sex organs may not match the internal sex organs or genetic sex.
Ambiguous genitalia isn't a disease. It's a sign of a condition that affects sexual development, and it's referred to as a disorder of sexual development.
Usually, ambiguous genitalia is obvious at or shortly after birth, and it can be very distressing for families. Your medical team will determine the cause of ambiguous genitalia and provide information and counseling that can help guide decisions about your baby's gender and any necessary treatment.
Your medical team will likely be the first to recognize ambiguous genitalia soon after your baby is born. Occasionally, ambiguous genitalia is diagnosed before birth (prenatally). Characteristics can vary in severity, depending on when during genital development the problem occurred and the cause of the disorder.
Babies who are genetically female (with two X chromosomes) may have:
Babies who are genetically male (with one X and one Y chromosome) may have:
Ambiguous genitalia occurs when something goes wrong during pregnancy to interrupt or disturb the fetus's developing sex organs.
A baby's genetic sex is established at conception, based on the sex chromosomes. The mother's egg contains an X chromosome, and the father's sperm contains either an X or a Y chromosome. A baby who inherits the X chromosome from the father is a genetic female (two X chromosomes). A baby who inherits the Y chromosome from the father is a genetic male (one X and one Y chromosome).
Male and female sex organs develop from the same tissue. Whether this tissue becomes male organs or female organs depends on the chromosomes and the presence or absence of male hormones.
A disruption of the steps that determine sex can result in a mismatch between the appearance of the external genitals and the internal sex organs or the genetic sex (XX or XY).
Causes of ambiguous genitalia in a genetic female may include:
Causes of ambiguous genitalia in a genetic male may include:
Ambiguous genitalia is usually diagnosed at birth or shortly after. Doctors and nurses who help with your delivery may notice the signs of ambiguous genitalia in your newborn.
If your baby is born with ambiguous genitalia, the doctors will work to determine the underlying cause. The cause helps guide treatment and decisions about your baby's gender. Your doctor will likely begin by asking questions about your family and medical history. He or she will do a physical exam to check for testes and evaluate your baby's genitalia.
Your medical team will likely recommend these tests:
In certain cases, minimally invasive surgery may be necessary to collect a tissue sample of your newborn's reproductive organs.
Using the information gathered from these tests, your doctor may suggest an appropriate gender for your baby. The suggestion will be based on the cause, genetic sex, anatomy, future reproductive and sexual potential, probable adult gender identity and discussion with you.
In some cases, a family may make a decision within a few days after the birth. However, it's important that the family wait until test results are completed. Sometimes gender assignment can be complex and the long-term impact can be difficult to predict. Parents should be aware that as the child grows up, he or she may make a different decision about gender identification.
Complications of ambiguous genitalia may include:
If your baby is diagnosed with ambiguous genitalia, you may worry about your child's future. Mental health providers can help you deal with this difficult and unexpected challenge. Ask your child's doctor for a referral to a therapist or counselor who has experience helping people in your situation. In addition to ongoing counseling for your family and your child, you may benefit from a support group, either in person or online.
Not knowing the gender of your newborn immediately can turn a hoped-for celebration into a stressful crisis. Until the medical evaluation is complete, try to avoid thinking of your child as either a boy or a girl.
Consider delaying a formal announcement of the birth until testing is complete and you've developed a plan with advice from your medical team. Give yourself some time to learn and think about the issue before answering difficult questions from family and friends.
Family history may play a role in the development of ambiguous genitalia, because many disorders of sex development result from genetic abnormalities that can be inherited. Possible risk factors for ambiguous genitalia include a family history of:
If your family has a history of these risk factors, consider seeking medical advice before trying to conceive. You may also benefit from genetic counseling.