Before the device, children who didn't talk and struggled with social situations would be forced to use laminated picture cards to communicate their wants or needs.
The popular app SPEAKall! now allows kids to drag pictures from the top of the screen down to the bottom to form sentences.
Phoebe Tucker, a speech language pathologist from Connecticut, told CNN: "Steve Jobs did not realise he was giving a voice to the voiceless."
The father of a young girl named Sharia said that the change brought about by the iPad was so significant that he often thinks of his daughter as "Sharia before the iPad" and "Sharia after the iPad".
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