Researchers in New Zealand are sceptical of US findings that cot death, or Sudden Infant Death Syndrome (SIDS), may be caused by an abnormality in the brain.
They say their advice to parents remains unchanged despite the new claims.
Twenty years ago New Zealand had the world’s highest SIDS rates, with 250 babies dying each year.
But education campaigns warning against tummy-sleeping, smoking and bed-sharing have seen that rate drop by 75%.
Read Steps to reduce risk for SIDS in infants