We acutally ended up cancelling our order as i went in just to make sure mattress fits and there is still a bit of a gap! they say can be 4mm... i just was to unsure..i ended up getting ther Boori cot and change table from David jones and it was less! and felt sturdy etc etc.. Boori are made i australia to aust standards etc... Im now trying to see i I can also get the cradle.