There is no such thing as a child with a short memory, it should be a child with a poor memory. It may be caused by lack of nutrition, mental retardation, heredity and so on. 1. Lack of nutrition: such as the lack of folic acid vitamin B₁₂, vitamin D, etc. may cause the nervous system function is affected, lack of zinc, lack of iron may also affect the development of the nervous system, which can affect the normal functional state of the brain, resulting in poor memory phenomenon. 2. Mental retardation: such as congenital chromosomal abnormalities, congenital hypothyroidism, or fetal brain tissue damage caused by birth injury during pregnancy. Poor memory and other cognitive deficits may occur. 3. Heredity: When the parents have poor memory, the child may also inherit the characteristics of the parents and thus have poor memory. It is recommended that children with poor memory should go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying the condition.