Maturation of the speech mechanism.
D000375:Aging; D002648:Child; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010159:Palate / Q000254:growth & development*; D010614:Pharynx / Q000254:growth & development*; D013060:Speech; D014059:Tongue / Q000254:growth & development*; D014831:Voice