To identify male patients who were treated with infliximab and had fathered healthy newborns during their management.We reviewed medical records of men with ankylosing spondylitis (AS) who were followed up at the Rheumatology Outpatients clinic and were treated with infliximab during the period 2001-2007.We identified 4 patients with AS who had fathered 6 healthy children during infliximab treatment. One patient was also treated with small doses of methotrexate.Limited data are available concerning the effects of infliximab on semen quality. Our cases provide some evidence or reassurance for male patients treated with the anti-tumor necrosis factor-alpha agent. Further prospective studies are necessary, however, to guide clinicians in decision making.