R.S.
Hello!
Instead of buying a toddler bed that my kids would only sleep on for a few months, I just put a mattress on the floor. When they did fall off, it was only a foot off the ground. (I put a bean bag beside the bed, too.) As they got older...maybe around 3 1/2, I put the box springs underneath the mattress..then the frame later. It's almost like taking baby-steps to get them ready for a big bed, and not such a drastic move from a crib.