Sudden Infant Death Syndrome (SIDS) is the unexpected and unexplained death of an otherwise healthy infant, usually during sleep. It typically occurs in babies under one year old and is most common between two and four months of age. The exact cause of SIDS is unknown, but it is believed to be related to factors such as sleep position, sleep environment, and developmental issues. To reduce the risk of SIDS, caregivers are advised to place infants on their backs to sleep, use a firm mattress, and keep the sleep area free of soft bedding and toys. Additionally, avoiding exposure to smoke and ensuring a comfortable room temperature can help create a safer sleep environment for babies.