I recieved this crib for my shower and thankfully I did not assemble it right away. I went to the local BRU and have no clue what made me lift the mattress on the display but I am glad I did. The mattress is held up with a thick piece of plywood. I asked where the typical spring type support was and was told that Delta LUV { manufacturer} does not put the spring style supports on their cribs anymore. I mentioned the sturdiness or there lack of to the clerk and she told me alot of the cribs now a days have the plywood type supports. In my eyes this crib and any with the plywood supports are not going to hold an older child who may jump around in the crib. Also how as a day bed is this plywood going to hold up? Not very good in my eyes. If I were you I'd keep looking.