This mattress is still AHHH-MAZING!! I say this because it has retained it's shape and form beautifully and if baby's diaper leaks overnight (and they will as they get bigger!) you can easily clean the mess. We use a waterproof mattress pad, but still, when everything is in the wash, I still give it a good wipe down. Baby loves it and she's 20 months now. One thing i really appreciate about it and you may not care about this, but since there are no springs, she has never had the urge to try and jump up and down on it and escape the crib.
Also, some of you have asked about the size of the mattress and it is at least average crib mattress size, if not longer. I am paranoid by design and I never had one unsafe thought or experience with this mattress. I suppose if you are using an older crib or a HUGE one, you may have minor issues, but we use a solid wood crib to full size bed convertible type ($$!...don't even get me started on the cost of a good...