Ds will be 3 in September. He has a huge vocab and most of what he says is understandable by me, and I think most people would get the gist of what he is saying, but there are still a number of sounds he doesn't say clearly, e.g. Fook instead of book, diss instead of kiss, dare instead of there, focolate instead of chocolate etc. He has a mild uncorrected tongue tie too. TIA.