My 21 month old little guy has been a liitle bit slower in his speech , but has an older brother who has more than enough words for the whole family! The wierd part is, he growls everything. All of the words he does say are in a low throaty growl. People look shocked and giggle everytime he speaks.The tiny tiny bit that he does use his voice the tiniest cute almost comical sound comes out. He can hear well, because his comprehension is phenomenal. I am not really worried here... more curious to know if others experience this. When did your child grow out of it?