I went over the levels of giftedness and I believe he is a Level 4.
If you are feeling really brave go to the Reccomended Resource Forum and check out the other Ruf link, the one that tells how each level of school interacts with kids of various levels of giftedness.
If you can get the book that this is all based on (Losing our Minds) from Interlibrary Loan, perhaps you can read some of the cute stories aloud to your husband, or leave it in the bathroom where he might accidentally read it. By printing out the lists and putting them on the refrigerator so you can fill in the dates as you go, your husband will see it in "black and white." Another approach is to get some general parenting books from the library and post the normal milestones with the normal ages, so he can see for himself. Of course the best way is to find some normal 3 year old kids and let DH be in charge of a few playdates, or make sure he spends time at the preschool so he can see the range of what children are really like.
Best Wishes,
Trinity
