What does SIDS stand for?

Sudden Infant Death Syndrome is the correct term that refers specifically to the unexpected death of an apparently healthy infant, usually during sleep. This medical phenomenon typically occurs in babies under one year of age and remains unexplained after thorough investigation. Understanding SIDS is crucial, as it has significant implications for public health and safety, particularly concerning safe sleep practices for infants. The other options do not accurately reflect the established medical terminology and research around the phenomenon, which is why they are not the correct answers.