Delayed language development in children is a phenomenon in which the ability to express and understand language lags significantly behind that of children of the same age. The main causes of this phenomenon include poor language environment, hearing impairment, mental retardation, and central nervous system disorders. Parents should be aware that if the following manifestations occur, the child may have a language delay and needs to be trained accordingly. Common manifestations: 1. When the child reaches the age of speech, he or she cannot say a complete word, such as mom, dad, etc.; 2. After starting to speak, he or she speaks more slowly than children of the same age or tends to stagnate in speech; 3. When speaking, speech is incoherent, inaccurate pronunciation, poor communication skills, slow response to questions, etc. Training methods 1. The basic method of learning for children is imitation, so parents should create a good language learning environment for their children, talk more with them, exercise their language comprehension and expression ability, and encourage them to learn to express their requirements in language; 2. If the child has a psychological behavior disorder, it is best for parents to take the child to the hospital and consult a doctor for psychological guidance; 4. If, in addition to delayed language development, the child also has slow reactions, poor hearing, and delayed motor development, it may be related to central nervous system diseases and needs further examination for organic lesions and early treatment. Note that children’s speech function development has its own golden period, such as 18 months when the vocabulary will produce explosive growth, so once the child’s language ability at home is significantly lower than that of his peers, it is important to seek medical attention.