What is sudden infant death syndrome (SIDS)?

Written by Yuppo Lab Experts.

Updated 27 October 2026

Sudden infant death syndrome (SIDS) is the sudden, unexplained death of a seemingly healthy baby under 1 year old, usually during sleep. The risk is highest in the first 6 months, and safe sleep practices lower it significantly.

How can I lower the risk?

Key steps recommended by the American Academy of Pediatrics and the NHS:

  • Always put your baby on their back to sleep
  • Use a firm, flat mattress with nothing else in the cot
  • Keep your baby in your room for at least the first 6 months
  • Do not smoke during pregnancy or around your baby
  • Never sleep with your baby on a sofa or armchair
  • Avoid overheating
  • Breastfeeding and offering a dummy at sleep time are linked to lower risk

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