My 3 year old can read

I had to bring my 3 and a half year old son with me to my doctor appointment, so I brought some things for him to do during my exam. I brought a dot-to-dot book and a few books for him to read.
I know he can read, he started sounding out words at 2-1/2. By 3-yrs old, he had mastered silent e and was working on vowel teams. He now understands punctuation and how it tells you how to say the sentence. Exlamation points are his favorite. This is no shock to me.
It was, however, quite a shock to our family doctor. She abandoned my exam to gush over his reading skills. She said he's reading at a first grade level... at 3-1/2! Her son is in kindergarten and is an advanced reader, she said. Then added that my son is reading the same level books that her son is... and her son is 5. She kept gushing... "He's gifted! Really! He is! You should look into programs for him."
Of course, I'm proud as a peacock, even though this is not my doing. My son has always been interested in letters... how they sound, and how they work together. My job is to keep it fun for him. We play I-SPY with sight words in a story. I buy books about bugs, Spongebob, and gross body functions... stuff boys like. I'm super-enthusiastic when he gets it right.
I'm a very proud mama today!