We bought bunks when we got Tallon's big bed.. I was only JUST pregnant with Kayla then. There's no way I would be able to assemble a bed myself. These ones can be separate beds or bunks I don't think they recommend top bunks for under 5's. So they'll either be sharing a bed (top to tail) for a while, or we'll squeeze 2 single beds into the room... will be very squishy tho LOL.