I did not realize that all four sides are fixed once you assemble the crib. I wish one side would come down to put baby in. I'm only 5"1' so I can't really reach to lay her down in it.  My 6 month old can stand up on her own, holding onto the rails, so I have to put the mattress on the lowest setting. I'll have to wait until she's old enough to tuck herself in... bummer