Sudden Infant Death Syndrome Is Most Common in Infants Age 1 Month to 1 Year
Sudden infant death syndrome (SIDS) is the sudden, unexplained death of a seemingly healthy baby. SIDS is most common in infants age 1 month to 1 year, with the highest risk between 2 and 4 months. After 6 months, the risk drops sharply, and SIDS is rare after 1 year.
Why Age Matters for SIDS Risk
During the first months, babies are still developing control over breathing and arousal from sleep. Brainstem immaturity, exposure to smoke, soft sleep surfaces, and overheating can increase danger. Premature birth and low birth weight also raise the chance of SIDS in this age window.
Safe Sleep Practices to Lower SIDS Risk
Health experts recommend placing babies on their back for every sleep, using a firm flat mattress, and keeping the crib free of pillows, blankets, and toys. Room-sharing without bed-sharing, breastfeeding when possible, and avoiding smoke exposure are also linked to lower SIDS rates. For more guidance, see the CDC safe sleep recommendations.
