Thanks for your input! Funny, we had a early intervention eval done at 15 months too for speech delay, of course he started a month later. A developmental specialist worked with him for about 6 months due to his over fascination with letters and numbers at the time. The fascination with letters went away once he taught himself to read (somewhere in the 2.5-3 year range) but he still really loves numbers/math, but less fascinated than before.