This is a very interesting thread. Even though I shouldn't compare, I find myself constantly baffled by the difference between DD7 and DS3. My DD hit all of her 'milestones' so early that it didn't even make sense to read any of the early years info, books, etc. My DS3 is a whole different ballgame. I'm assuming that my DS3 is developmentally 'typical' but it's so hard trying to figure it out when my only point of reference is DD. On the flip side my DS3 is so much more emotionally mature than DD7!!!! I don't think that he has ever experienced a true 'tantrum' and seems to have deep emotional insight and a sensitivity for others that DD is just starting to understand. The other bonus is that he is never so consumed in his own thoughts that he can always remember where I put the car keys!