I do not know why people give this mattress such good reviews. My baby is 4.5 months now, and from the very beginning, when she was less than 6 lbs, this mattress sinks in the middle where the baby lies! I put her on one side and the other and no difference. My baby also sweats unusually more on this mattress compared to our bed or other cushions we lay her on. Something about the waterproof material makes her get very hot on this. I don't think the cushioning on this mattress is even comfortable, it seems so cheap! This is definitely not worth the money, it's not even that cheap! I would NOT recommend.

Cons: sinks in the middle, baby gets very hot on it, not comfortable