A review of 33 infants treated over 25 years for benign sacrococcygeal teratoma shows that this is predominantly a newborn tumour presenting mostly as an external mass and carrying an excellent prognosis provided surgical treatment is prompt and complete excision accomplished. Resectability was 100% in this series as is usually the case. This tumour must however, be differentiated from other masses presenting in the sacrococcygeal area by a careful histologic study since these other lesions generally require a different therapeutic approach.