The official advice is for occasional overnight use only. I am getting a special breathable mattress to put in it, not the one it comes with and want to use it overnight for a 7-8 week old baby while we are away for a 2 week holiday. Would you do it? Any advice? I've been told two reasons why they don't recommend it. One is because mattress is not breathable - but I am resolving this by buying the breatheable mattress - the other is the material of the carry cot itself - but if it is approved for babies to sleep in during the day then it can't be that bad can it?