I. Overview Language is a high-level neural activity unique to humans and is an important ability in learning, social interaction, and personality development. Language development in children marks the overall development of children. The meaning of words is expressed by sound, and it is a gradual process for infants to distinguish and make speech sounds. The first cry after birth is the earliest pronunciation, which is also the basis of future language. At the age of 2 months, infants can respond to the emotions contained in language, such as crying when hearing angry reprimands from parents, and laughing when comforting babies in harmony. At 5 to 6 months, they can make monosyllabic words, and at 7 to 8 months, they can make compound sounds, such as daddy, mommy, and dada, and can repeat simple syllables made by adults. 2, word period After 1 year old can say words for daily life, such as eat, sleep, go, etc. At 1.5 years old can speak single sentences, can use language to express requirements, such as “eat”, “mom hug”. The language of this period is characterized by single-word sentences, the ability to use gestures and expressions to support language to express needs; the ability to use animal sounds to replace their names; the ability to imitate the sounds they hear, such as asking: how old are you? He can parrot-like repeat: How old are you? During this period, children begin to know the names of things and like to ask their names, and the number of words increases rapidly. 3. Single-sentence period (1) 2-2.5 years old, during this period, infants’ language development is very rapid, and they have generally mastered the basic language of their nation. From single words to two-word words, they can speak simple sentences, short sentences, pronouns such as you, me, and him, and begin to accept the unique grammatical habits of their native language, such as using exclamations to express feelings and questions. They can say simple words correctly, such as “Mommy is going to work,” and can look at pictures and use pronouns, such as “you, me, and him,” between the ages of 2 and 3. (2) 2.5-3 years old, this stage will use complex sentences, but still relatively short, 6-10 words, like to ask questions, so also known as the “good question period”. (4) The completion period: 3-6 years old, by the end of 3 years old, the infant has mastered the most basic vocabulary, that is, the most basic language, speaks fluently, can use all words, and can find grammatical relationships in adult speech, correct their own wrong temporary grammar, and gradually form real language, which makes it possible for the infant’s mental activity to begin to generalize, so that the infant can begin to recognize things that are not available from direct experience. Things. Cautions The development of the child’s speech. In addition to being closely related to brain development, it is necessary to have normal hearing and articulatory organs. If the child’s environment is monotonous and he or she is exposed to few people, the child will be late in speaking; there are also children who are not backward in intelligence but are late in language development, and even late in starting to speak normally at the age of 2 to 3. If a child is still unable to speak at the age of 2.5 years or older, he or she should be examined by a hospital in a timely manner.