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What is the safest sleep position for a newborn?

Always place a newborn on their back for every sleep, on a firm flat surface, with no soft bedding or toys — this is the single most protective, evidence-based step against SIDS.

Side and stomach sleeping raise the risk of sudden infant death, especially in babies used to sleeping on their backs.

Strength of evidence

Strong

Based on national guidelines from Canadian and US health authorities, drawing on large epidemiological studies conducted after the 'Back to Sleep' campaigns began.

What the evidence says

Public health agencies in Canada and the US agree: babies should be placed on their backs for every single sleep, naps and nighttime, until at least their first birthday. This is described as one of the most protective things a caregiver can do against Sudden Infant Death Syndrome (SIDS).

Side and stomach sleeping are linked to higher SIDS risk. This matters even more for babies who normally sleep on their backs but are occasionally placed on their stomachs, as that switch seems especially risky.

Back sleeping is safe even for babies who spit up or have reflux, since a healthy baby's airway anatomy and reflexes protect them from choking in that position. Once a baby can roll both ways on their own (usually around 4-6 months), you don't need to flip them back if they roll onto their side or tummy during sleep.

Other key parts of a safe sleep setup: a firm, flat crib or bassinet mattress with a fitted sheet, no pillows, blankets, bumpers or soft toys, and room-sharing (not bed-sharing) with your baby for at least the first six months.

Sources

✓Reviewed by CH, MD, FRCPC

Reviewed by a specialist physician certified by the Royal College of Physicians and Surgeons of Canada, who has read this answer against the sources listed above and confirmed it reflects them. That is not medical advice about your child. How we review

Answer checked July 29, 2026

Educational information only. Not medical advice, not a diagnosis, and no doctor-patient relationship is created by using this. Founded Parent has not examined your child and does not know their history, so this may not apply to you. In an emergency, call your local emergency number. What Founded Parent cannot do

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Educational information only. Not medical advice, not a diagnosis, and no doctor-patient relationship is created by using this. Founded Parent has not examined your child and does not know their history, so its answers may not apply to you. Never delay or disregard advice from a qualified health professional because of something you read here. In an emergency, call your local emergency number.