I ordered a travel cot and have just put it up and the mattress is pretty much just a plank of wood, would not be comfortable at all, my DM also ordered one and has the same issue with the mattress, surely this isn't normal to expect me to put my baby to sleep on a solid base? Should I buy a mattress to go in it? Kind of defeats the purpose of it being for travel if I'm having to lug a mattress too!