Infants are 0-1 year old children, infants are 0-3 year old children, the degree of infant speech is specifically as follows: 1, between 0-1 year old children in general situation will not speak, just simply issue a single sound or even 1-2 words, at most no more than three words; 2, normal children often in 6-7 months will issue a single sound, at this time its performance a, ma or ba pronunciation; 3, wait until the child When the child develops to 9-10 months, the first word may appear, and there may be superimposed words such as daddy and mommy; 4, the specific words that can become 2-3 words or even short sentences may need to wait until the child reaches one year and five months to one year and six months; 5, when the child can say a complete sentence, that is, the sentence contains the subject, predicate, object structure, often until the child develops to about two years old The child’s development is often around two years old.