Two research studies carried out by the Scottish Cot Death Trust have shown an increased risk of cot death for babies sleeping on a mattress previously used by another baby. The risk was very small if the other baby was an older brother or sister in the same family but higher if the mattress was second-hand from another home. More research is continuing on this subject but meantime you may choose to avoid any potential risk by buying a new mattress. Otherwise, make sure the mattress is very clean, dry and in good condition. It’s best to choose one which is totally covered with plastic which can be easily be washed down. For more information about safe sleeping practices click here.