The poor cognitive comprehension ability of 2-year-old babies can be a physiological phenomenon, but also does not rule out autism, hypothyroidism, etc., mainly to take thyroxine tablets and other medication and education and training to improve the way. 1. Physiological phenomenon: the poor cognitive comprehension ability of 2-year-old babies may be related to environmental factors, such as children brought up by grandparents for a long time, the lack of normal education and guidance, or the child is naturally more introverted, not good at expression, may be mistaken for poor cognitive comprehension ability. 2. Autism: There are usually language developmental disorders, socialization disorders, stereotyped movements, and so on. Poor cognitive comprehension is also one of the aspects. Currently, rehabilitation treatment is mainly based on education and training methods such as ABA training method and floor time. 3. Hypothyroidism: This is a disease that seriously affects the child’s brain and physical development. The earlier the onset of the disease, the later the treatment, the greater the damage to the brain, often manifested as a special face, body proportion disorders, accompanied by serious intellectual development backwardness, the main use of levothyroxine sodium tablets as a substitute for treatment. 2-year-old baby cognitive comprehension ability is poor may also be cerebral palsy, hepatomegaly nuclear degeneration, etc., suggest timely pediatric medical assessment, if necessary, under the guidance of the doctor’s active treatment. The above medication should be used in accordance with medical advice.