Hi, We're going to MIL's next weekend. She went to a great deal of effort to dust off my husbands cot from when he was a baby for us to use. Problem is I had thought she would have bought a new mattress but she hasn't. Am I being over cautious to not want to put my baby down on something that's been in an attic for 33 years? DS is 6 months now...Opinions appreciated!