SIDS Risk by Age: When Does the Danger Decrease?

SIDS risk peaks at 2–4 months and declines sharply after 6 months. By 12 months, risk is extremely low.

Age Distribution

• <1 month: Rare (but possible).
• 1–4 months: 70% of cases.
• 4–6 months: 20%.
• 6–12 months: <10%.
• >12 months: Classified as SUDC (Sudden Unexplained Death in Childhood).

Why Risk Drops

• Brainstem arousal/respiratory centers mature.
• Motor skills: can lift head, roll, move away from obstruction.
• Sleep architecture: more adult-like cycles.
• Immune system stronger.

Continued Safe Sleep Until 1 Year

AAP recommends back sleeping, firm surface, no soft bedding through first birthday. After 12 months, toddler bed transition.