Our 6 month old little boy is going to spend the weekend with his grandparents while my sister gets married. His granny has got him a cot from a friend. I'm not sure whether we need to get a new mattress for it (I know it's recommended that you get one for each new baby). I would do like a shot if he was going to be there for longer than a couple of days here and there but I'm not sure what to do in this situation. i'd be really interested to hear what other people think.... I also don't want to offend her. help!!!