"It's important that children under three months sleep in their own beds," Kerstin Nordstrand at the National Board of Health and Welfare told AFP.
She said the recommendation was "new", since the institution had previously only advised against new-borns sleeping in the same room as a smoker or in the same bed with a parent under the influence of drugs or alcohol.
The information was first published by Swedish medical newspaper Dagens Medicin, which cited a paediatrics professor at Gothenburg University.
The practice is reportedly widespread in Sweden.
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A report published by the British Medical Journal which analysed nearly 1,500 sudden infant deaths revealed that 22 per cent took place while the baby slept in the parental bed.
According to professor of medical statistics, Bob Carpenter, who was responsible for the study, the risk of cot death for babies sleeping with their parents was multiplied by five compared to those who slept alone.