overview and norms
Children will say some sounds the wrong way as they learn to talk. They learn some sounds earlier, like p, m, or w. Other sounds take longer to learn, like z, v, or th. Most children will be able to say all sounds in English by 8 years old. A child who does not say sounds by the expected age may have a speech sound disorder.
Your child may have trouble making sounds. He may substitute another sound, leave sounds out, add sounds, or change the sound. It can be hard for others to understand him.
Not every speech error is a problem. You and your child may sound different because you have an accent or dialect. This is not a speech sound disorder.
Taken from The American Speech-Language-Hearing Association website on 3/4/2019
