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Sudden Infant Death Syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Children Teenagers

Sudden Infant Death Syndrome

Sudden infant death syndrome (SIDS) is the unexplained death of an infant under one year old, but specific safety practices can help reduce the risk.

Overview

Sudden infant death syndrome (SIDS) is the sudden, unexplained death of an infant younger than one year old. Some people call SIDS "crib death" because many babies who die of SIDS are found in their cribs.

Risk Factors

SIDS is the leading cause of death in children between one month and one year old. Most SIDS deaths occur when babies are between one month and four months old. The following groups have a higher risk of SIDS:

  • Premature babies
  • Boys
  • African Americans
  • American Indian/Alaska Native infants

Risk Reduction

Although the cause of SIDS is unknown, there are steps you can take to reduce the risk:

  • Placing your baby on his or her back to sleep, even for short naps. "Tummy time" is for when babies are awake and someone is watching.
  • Having your baby sleep in your room for at least the first six months. Your baby should sleep close to you, but on a separate surface designed for infants, such as a crib or bassinet.
  • Using a firm sleep surface, such as a crib mattress covered with a fitted sheet.
  • Keeping soft objects and loose bedding away from your baby's sleep area.
  • Breastfeeding your baby.
  • Making sure that your baby doesn't get too hot. Keep the room at a comfortable temperature for an adult.
  • Not smoking during pregnancy or allowing anyone to smoke near your baby.

Frequently Asked Questions

No, car seats and strollers are not designed for extended sleep. They can increase the risk of suffocation and positional changes that may lead to SIDS. Use them only for short trips or when the baby is awake and supervised.
First, check that the baby’s sleep environment is safe: no loose bedding, stuffed animals, or toys in the crib. Make sure the room is at a comfortable temperature and that the baby’s clothing is appropriate for the season. If the baby is still crying after a few minutes, gently soothe them by patting or rocking, but avoid placing them on your chest or in a prone position. If the crying persists or you notice breathing irregularities, seek medical attention promptly.
Place your baby on a firm, flat sleep surface such as a crib mattress with a fitted sheet. Keep the baby’s head and shoulders level, avoid pillows or soft bedding, and ensure the room temperature is comfortable for an adult (around 68–72°F). Check for any flat spots on the baby’s head and rotate the baby’s position regularly to prevent positional plagiocephaly.
Yes, breastfeeding has been shown to lower SIDS risk. Aim to breastfeed exclusively for the first six months, and continue breastfeeding for at least one year if possible. Breast milk provides immune protection and promotes healthy sleep patterns, both of which contribute to lower SIDS risk.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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