_:vb50952743 . _:vb50952743 . _:vb50952743 "url:https://www.stanfordchildrens.org/en/topic/default?id=speech-sound-disorders-in-children-160-236"^^ . _:vb50952743 . _:vb50952743 . _:vb50952743 "A speech disorder that involves mispronouncing speech sounds by omitting, distorting, substituting, or adding sounds which can make speech difficult to understand."^^ .