A cot for my baby

I am brand new to caravaning! We have just bought our first caravan and will be picking it up on the 27th may. I'm looking for some advice/info on if there is some way to make the bunk into more of a cot for my 10 month old baby? As she is not ready for a bed I would like to know if I can buy some kind of rail to put across the bed? Any help and advice would be greatly recieved.