Should not be too soft or too hard.
You can't choose a mattress that is too soft, nor can you choose a mattress that is too hard. Too soft can easily lead to poor release of the cervical spine and long-term bending. An excellent mattress is good for cervical vertebrae, but it is uncomfortable to sleep.
Environmental protection material
Secondly, we should pay attention to whether it is environmentally friendly. Many manufacturers' products have a strong smell, and it is easy for formaldehyde to exceed the standard.
Brand selection
At present, there are not many brands making children's mattresses on the market, such as Mlily Dream Lily, Simmons and Deng Lupu, which are all relatively OK brands. I suggest you go to the physical store to see these brands.