A surrogate mother is a woman who carries and delivers a baby for someone who cannot carry a pregnancy themselves.
The American Society for Reproductive Medicine defines a surrogate as a woman who carries a pregnancy for another person unable to carry it herself. In almost all cases today she is a gestational carrier, meaning the baby is not genetically hers.
Most professionals now say "surrogate" or "gestational carrier" rather than "surrogate mother," because in gestational surrogacy the woman has no genetic link to the child. We use "surrogate mother" here because it is the phrase most people search for; our guide to gestational carrier vs. surrogate explains the distinction.
Who becomes a surrogate?
Surrogates are not a single type of person; they are women who have already had healthy pregnancies and choose to carry for someone else. In practice they share a consistent profile, because screening requires it: typically 21 to 43 years old, with at least one previous uncomplicated pregnancy, currently raising children of their own, in good health, financially stable, and with a solid support system. Beyond those requirements they vary widely in background, education, and location, though more are found in states with clear surrogacy laws.
Why women become surrogates
When researchers ask surrogates about their motivation, the desire to help consistently outranks money, even though compensation is what makes participation feasible. Many have watched infertility up close, in themselves or someone they love, and want to give another family the experience of a child. Some genuinely enjoyed being pregnant and want to experience it again without expanding their own family. The compensation matters and is fair, but it tends to be the practical enabler rather than the driving reason.
The main types of surrogate
Surrogates are described in a few different ways depending on genetics, payment, and relationship to the parents.
- On genetics: a gestational carrier has no genetic tie to the baby and carries an embryo made through IVF, while a traditional surrogate uses her own egg and is the biological mother; gestational is about 95% of arrangements.
- On payment: a compensated surrogate receives a fee plus expenses, while an altruistic surrogate receives only expense reimbursement.
- On relationship: a known surrogate is a friend or family member, while an unknown surrogate is matched through an agency or platform.
Common myths about surrogates
Several persistent myths misrepresent who surrogates are, and the screening process directly contradicts most of them.
- "They do it only for the money." Studies consistently find helping others is the top motivation; compensation makes it possible but is not the driver.
- "They can't emotionally let go." In gestational surrogacy the surrogate has no genetic tie, and research shows most maintain healthy emotional boundaries and feel fulfilled rather than bereft.
- "They're being exploited." Ethical surrogacy requires fair pay, separate independent attorneys, and psychological support. The American Bar Association publishes guidance on surrogacy ethics.
- "They come from unstable situations." Screening specifically requires financial stability and a strong support system, which rules the unstable out.
What to do next
If you are considering carrying for someone else, the practical next question is whether you qualify. Our guide to surrogate qualifications covers the criteria, and how to become a surrogate walks through the path from there.
Frequently asked questions
What is a surrogate mother?
A woman who carries and delivers a baby for someone who cannot carry a pregnancy themselves. Today she is almost always a gestational carrier, meaning the baby is created from the intended parents' or donors' eggs and sperm and is not genetically hers.
Is a surrogate the baby's biological mother?
Not in gestational surrogacy, which is about 95% of cases. The baby's genetics come from the intended parents or donors. Only in traditional surrogacy, where the surrogate's own egg is used, is she the biological mother.
Why do women choose to become surrogates?
Research consistently finds the main reason is a desire to help others build a family, often after seeing infertility firsthand. Compensation matters and is fair, but tends to be what makes participation possible rather than the primary motivation.
What are the requirements to be a surrogate?
Generally 21 to 43 years old, at least one previous healthy pregnancy, currently raising a child, a healthy BMI, non-smoker, and financially stable, plus passing medical and psychological screening. See surrogate qualifications for the full list.