Deafness/Hearing Loss - When a child cannot hear certain speech sounds, they will omit them or pronounce them incorrectly. Before beginning speech therapy, it is important to have your child's hearing checked to ensure that there are no concerns.
Hereditary - If a parent or grandparent had struggled with speech sound acquisition growing up, it is more likely that the child will as well.
Recurring ear infections - If your child experienced frequent ear infections that diminished their ability to hear for a period of time, this may cause speech delays.
Structural abnormalities - The physical shape of a child's mouth, nose, and throat all affect how they produce speech sounds. Low muscle tone, missing teeth, untreated cleft lip/palate, an enlarged tongue, ankyloglossia (tongue-tie), or enlarged tonsils can cause children to develop speech sound errors. An SLP will typically conduct an OME (oral-motor exam) to check for any abnormalities.
Childhood Apraxia of Speech (CAS) - Apraxia is a motor speech disorder in which the brain has difficulty sending signals to the muscles of the mouth to produce speech sounds correctly. With this disorder, the speech muscles aren't weak, but they don't perform normally because the brain has difficulty directing or coordinating the movements. Apraxia is diagnosed by a neurologist and can be treated with speech therapy.