Our little one has not arrived yet but this mattress seems very comfortable and sturdy and it fits perfectly in the DaVinci Kalani crib with no extra space on the sides. The mattress has a coating that seems like it will help with leaks but it does not have a "plasticy" feel to it. I will still put a waterproof mattress cover on it, but the material gives me additional peace of mind about potential diaper messes. It also has more than enough coils to meet current safety standards, which provides further peace of mind. Great deal for the quality!