This bed is very flimsy.  Within one week several of the bottom slats broke under the weight of my son (he's 30 lbs, so pretty average size). The wood is weak pine and breaks easily.  Also, after adding a mattress that was within the specified size, the side railings barely cleared the top of the mattress (maybe 2 or 3 inches above).  As a result, my son has fallen several times and hates his bed.  We are seriously considering just ditching the thing altogether.