Possibly over anxious gran to be, but my someone has given me a Troll bedside cot and my son said he and partner want one for when their baby is born. I know they will need a new mattress, but when I looked online at John Lewis I could find co sleeping cribs but no co sleeping bedside cots. So are they safe? Are they a good thing to use? The Troll one is still on their website but doesn't seem to be on sale in U K. but no information online about any safety issues.