I purchased the Delta 2 in 1 Mini Crib with this mattress Colgate 3" Mini Crib Mattress fits all sides narrow and without gaps. It's a little tight, but when you press it down the mattress doesn't flex. .Over the protector I have 100% cotton jersey sheets from the American Baby Company. They're a bit flimsy and I wonder how many washes they'll hold up, but they sit flat and snug on the mattress. Now buy extra sets of protectors and sheets as I know they go well together.
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