Yours, Etc.: Origins and Uses of 8 Sign-Offs
sudden infant death syndrome sud·den infant death syndrome (sŭd'n)
Abbr. SIDS A fatal syndrome affecting apparently healthy sleeping infants under a year old and that is characterized by a sudden cessation of breathing. Also called crib death.
Also called crib death, the deaths of sleeping infants less than a year old for unexplained reasons.