5-year-old babies with unclear speech and pronunciation may be caused by short tongue tie, hearing impairment, mental retardation, etc. Depending on the cause of the disease, it can be improved through surgery, wearing hearing aids, rehabilitation and functional training methods. 1. Short tongue tie: After birth, if the tongue tie does not retract below the root of the tongue, the tongue cannot extend completely, resulting in a short tongue tie, causing the pronunciation to be affected, and the 5-year-old baby’s speech is not clear. Under the guidance of the doctor can be through the tongue tie incision surgery for treatment. 2. Hearing impairment: when a 5-year-old baby has unclear speech and pronunciation, it may be due to abnormalities in the auditory system, such as transmission, nerve and sensory sound, causing hearing impairment. If it is mild hearing impairment, it can be improved by wearing hearing aids. If it is serious hearing impairment, it can be restored by cochlear implant surgery, which can restore the unclear pronunciation. 3. Intellectual disability: If the brain suffers from organic damage or incomplete brain development, it may lead to 5-year-old baby’s unclear speech and pronunciation, which is manifested in poor language ability, poor thinking ability and so on. At this time, it is necessary to carry out rehabilitation function training, such as cognitive function training, language function training, etc., to help alleviate unclear speech and pronunciation and restore self-care ability. When a 5-year-old baby has unclear speech, parents should take the baby to the hospital immediately to avoid delays and adverse consequences.