It is best to use a hard bed to sleep, because the bed is too soft, which is easy to cause spinal deformation, especially when children are in the growth and development period of spinal bones. If they sleep on a soft mattress for a long time, the depressed spinal segment will not be fully supported, which will lead to spinal deformation and skeletal dysplasia. As for hardness, the final standard is based on your own experience. There are two main criteria for mattress selection:

First, no matter what sleeping position a person is in, his spine can be kept straight and stretched;

Second, the pressure is equal, and people can fully relax when lying on it.

Choose a suitable mattress according to height, weight and sleeping position. According to your height and weight, choose a mattress with moderate hardness, hard or hard.

Generally speaking, most people are suitable to choose a mattress with moderate hardness, that is, a mattress with moderate hardness, while those who weigh between 60 kg and 70 kg are suitable to choose a "hard" mattress, and those who weigh more than 80kg should choose a "hard" mattress.

Besides height and weight, we should also consider sleeping position. If you are used to a sleeping position, it is difficult to correct it in a short time. You must choose a suitable mattress according to your sleeping position.