My friend has given me her old moses basket. She never used it - her kids have used it put their toys in. Looks brand new but do I need a new matress? I know I need a new one for a cot but can't find any advice on Moses baskets. Can afford a mattress but just don't want to be wasteful plus new mother anxiety has me worried that if I don't buy a new one I'm putting baby at risk. Please help me see sense.