SIDS most often refers to sudden infant death syndrome, the sudden unexplained death of a child of less than one year of age. Look up SIDS in Wiktionary, the free dictionary. SIDS may also refer to: Screening information dataset, a study of the hazards associated with a particular chemical substance Small Island Developing States, a group of developing small-island countries SID (disambiguation) This disambiguation page lists articles associated with the title SIDS.If an internal link led you here, you may wish to change the link to point directly to the intended article.