Sixty-eight previously infertile patients with endometriosis who had delivered a child tried to conceive again. Fifty-two of them were successful, 28 within 1 year, and 16 were not. The ability to conceive a second child was uniformly good regardless of the stage of the previous disease, the method of treatment, the duration of the initial sterility, or the age of the patient. Patients with endometriosis and infertility who deliver should be reassured concerning their chances of completing their families.