How to solve the problem of a 4-year-old child not pronouncing words clearly

Patient's question:

Hello, my son is 5 years old, but his pronunciation is unclear when he speaks. Sometimes it's hard to understand what he's saying. Which department should I see for this? Is this condition treatable?
Previous treatment history and effectiveness: He was examined at a local hospital for his tongue, and they said there was no problem. What kind of help is needed: How to correct his speech.

Doctor's answer:

Causes of Language Development Delay, Reasons Interfering with Children's Language Development and Growth
There are many reasons for language development delay in children, including common ones such as visual impairments, auditory impairments; intellectual development delay; inappropriate language environment; abnormal morphology or function of speech organs; incomplete brain development and brain damage, etc.
Advice: Children will never answer back; pay close attention and observe what the child dislikes, then guide them. It is important to teach them more in daily life. The above advice is for the question "5-year-old child speaks unclearly." It is hoped that it will be helpful to you. Wishing you good health!