My husband and I purchased this crib mattress for our first son, who is now two and a half. It's a great mattress for a really great price. It's firm, even today, two and a half years later. I don't see any signs of wearing yet. It's easy to clean too. We all know babies and toddlers have messy accidents. Some soap and water will do the trick. It's waterproof, so there are no worries of ruining the mattress. It fits both the crib (according to ASTM standards) and the toddler bed very well. Ever since our son started sleeping in it, he has slept very well at night. We now have it in his toddler bed and he still sleeps well on it, so I assume it's comfortable enough for both babies and toddlers. He loves laying on his bed even when he's not napping or going to sleep. We plan on purchasing another Sealy Baby Ortho Rest Mattress for our second son as well. This was a very good purchase on our part. Great mattress!