This mini crib mattress is strictly designed for baby's physical characteristics. It won't collapse, is firm which provides good support. The crib mattress meets the 16 CFR 1632 /1633 and 16 CFR 1241 Federal Flammability tests. Whether it's lying down or rolling on the mattress, there is no sound. So that can reduces tossing and turning, it can improve the quality of sleep.