I’m currently working as a private SLP and I have a 5yo who came to me with substitution of /t/ for /s/ and /sh/. He immediately was able to correct his production in isolation on the first session. (We targeted /s/ first) We have worked on C.V. productions and he can do them, as well. However, we have been working on initial position of simple CVC words and no matter how slow or the amount of visuals I give him, he always adds that /t/ sound back in! It’s been a few months now and we haven’t made any progress at this level. I targeted final position to change it up and he is doing pretty good there. Any pointers out there????