Louisiana Mommie, when did you start teaching him?
Jaluitgirl, thanks for taking time writing your experience with your son. I am new here and don't know how to give a karma to you? I understand that reading skills is a gradual process. That give me some idea: The kids probably learn new words quicklier the more words they know. Maybe we should add new words and retire old words more often after a while of teaching.
Speaking about test, I would be a bit disappointed when she answers wrong in a test (and that would be not good for the learing atmosphere), that's why I do not test my daughter often. Thus, I do not really know if she got word when it get retired. But I like the idea that it doesn't matter if they forget some words because they learned so quickly and so much. Moreover, when they are able to read new words they will able to read the forgotten words, too. Well, that is a long way to go. But I hope in 1/2 year I will also see some hint that she is able to "guess" words like your child .