Babys bed set up.

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My little girl is coming up 14mth and the oast few weeks she hates her cot. Shes always been ok in it untill lately. Soon as i put her in my bed shes flat out all night and looks cosy. I want to make her cot feel cosy but i dont know how 🤷‍♀️. She has a few little teddies at the bottom but thats it. Are they allowed covers in a cot? Pillows etc