Polly, This sounds so much like my son (now 7) that I am shocked. He did walk at 10 months, but nothing like talking way early or anything. He, too, did the CD/song by number around age 2, and the christmas he was 3 1/2 he got so into calendars that he could tell you what day of the week any date in 2005 2006 or 2007 was, jsut because he had been studying them. I did think, when he was almost three and he told me, "Mummy, Nine has two n's in it!" that he was sort of unusual, but I really had no idea. We had his tested a year go because he was behaving badly (unusual), we think due to lack of stimulation at school, and he came out in the 130s (frankly, I had thought it might might even be higher). He has now skipped second grade, and is doing 4th gr maths, having just turned 7. Your kid is one to watch!