In the U.S., 1 out of every 12 children has a form of speech-language disorder. That means that if you have a group of 12 friends, one of them will have problems with pronouncing words or putting sentences together. These problems do not need to be so extreme that they cannot talk at all. One of the most common problems is switching letters around or not saying the last letter of a word. For example, they might say "spacema" instead of "spaceman."
There are two types of speech-language disorders: speech disorders and language disorders. Speech is how we say sounds and words; language is how we use words to share ideas and communicate. If someone has a speech disorder, it means that that person cannot pronounce letters properly, or they switch letters around. These children might say "wed" instead of "red." If someone has a language disorder, it means that that person has problems with putting sentences together. These people might also have problems understanding things like plurals.

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