Children’s pronunciation is variable, and even the construction anomalies are sometimes unstable, for example, when saying “very short” they pronounce it well, but when saying “brother” they do not pronounce it well. In general, distortions are more frequent, meaning that the child may always pronounce the sound in that way, while omissions and substitutions lack consistency. It is important to be alert when any of the following abnormalities in phonology are found, and to identify the possible causes for early diagnosis and treatment: 1. Too quiet as an infant, or lack of response to loud sounds. 2. 2. Absence of any speech sounds until the age of 2 years 3. No sentences appear by the age of three. 4.After three years of age, most of the speech is still slurred. 5.After the age of five, there are still many omissions, substitutions or distortions in speech. 6.After the age of five, there is still an abnormal rhythm, speed or intonation of speech sentences. 7.Speech after the age of five still often has obvious errors. 8.Speech with a pronounced nasal overtone or lack of nasality. 9.Speech sounds are monotonous and flat, too loud or too low, or the sound quality is too poor. 10.The older you are, the less you speak or the less clear you are.