We are planning to transition LO to a floor bed within the next couple of months. Since we are in an apartment right now with little spare room, I was thinking I would just purchase a crib mattress and then upgrade to a twin mattress when we move in the fall. But I would love to hear what type of mattress you use so I can expand my research!

What kind/brand of mattress did you use?
Where did you buy your mattress?
How old was LO when you transitioned him/her to the floor bed?