Like Gigi said, cot went between the beds, but we put the pram under one of the bottom bunks,
so it wasn't even in the way.
Also when your bub is older, you can ask for a safety "rail" to be put on the top bunk. I usually
ask for two per bed since I have very mobile kids.

The youngest fell out of the top bunk anyways,
but since I push the bottom two beds together, he didn't land on anything hard.
-enk