My boy is doing a VB (ABA) program and 2 afternoons a week at mainstream school. He has learned his numbers up to 20 quite well, but now I want to move onto letters. Anyone out there have any tips on teaching the phonetic alphabet? He learned the ABC one via that Sesame street song, but learning how to sound out the letters has stumped me a bit. He only has about 50 words, so it's not so easy to explain things to him and lots has to be done with pointing and showing.