Astigmatism is a type of refractive error that is usually caused by irregularities in the shape of the cornea. The causes of astigmatism in young children include heredity, bad eye habits and trauma. 1. Heredity: Some young children’s astigmatism is caused by heredity and development, and the degree of this kind of astigmatism is usually more stable. 2. Bad eye habits: If children do not pay attention to their eye habits for a long time, some behaviors can make the eyelids cause undue pressure on the eyeballs, which can also cause astigmatism. 3. Trauma: If a child’s eyes have been injured, causing changes in the shape of the cornea, it can also lead to astigmatism. When astigmatism exists in young children, it is recommended that parents take their children to the ophthalmology department of a regular hospital as soon as possible to determine the degree of astigmatism and then determine the treatment plan according to the specific situation.