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Childhood apraxia of speech (CAS) is a speech disorder in which the child understands what he is trying to say, but his brain cannot arrange the necessary muscle movements to form the sounds. Infants with apraxia may not babble. Older children may be difficult to understand, and they may have difficulty with complex phrases or longer words. The patterns of speech errors are inconsistent, as well.
As you can imagine, not being able to communicate effectively can be quite frustrating. Children with apraxia often benefit from learning sign language to communicate their needs and wants. They also tend to make better progress with speech and language while undergoing intensive, frequent speech therapy. Practice is also essential, particularly speech therapy at-home exercises. One of the tools for speech therapy you can try is the use of apps. Some speech therapy apps are intended specifically for children with apraxia.