What bedding to put in cot

Jade
I have bought a coverlet and bumper set as well as the sheets and a fleece blanket but is that all I will need at first? I read somewhere that you shouldn't use a duvet for the first year and should use a sleeping bag instead. Also don't worry I'm not using the bumper but I could only get the coverlet and bumper as a set.
Any advise would be very useful xx

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