When you are going to buy a mattress for your baby or child, there are several things that you have to take into account. First of all, it is important to look at the material of a children's mattress. There are different types of fillings, including cold foam, PE foam, memory foam and polyester. The latter is optimally ventilated, which is an important factor for a good night's sleep. In addition, polyester is much more hygienic due to its open structure. Moisture does not remain in our children's mattress, which prevents irritation at night. In addition, a washed mattress is so dry.