Four-year-old children’s unclear speech may be related to poor language environment, delayed language development, disease, etc., you can go to the hospital to do the relevant examination and then targeted treatment. 1. Poor language environment: when children learn to speak, the language environment is not good, such as different dialects, accents, so that the language in the child’s brain will be confused, the phenomenon of the child’s speech is not clear, you can improve the language environment, parents usually have to accompany the child to speak more, more practice, improve the symptoms. 2. Delayed language development: the child’s unclear speech may be caused by delayed language development, you can encourage the child to talk more, communicate with children of the same age, and consciously train the child’s language skills. 3. Disease: If the tongue tie development is abnormal, it can also cause the child to speak unclearly, you can take the child to the hospital for examination and repair through minor surgery. It is recommended to take your child to the hospital for examination and treatment under the guidance of the doctor after finding out the cause.