DD was very verbal very early--first word 7 months, sentences by 12 months, paragraphs by 18 months. She also knew the alphabet and numbers at about age one. She freaked people out.
DS was verbal for a boy, but not nearly as much as DD. We didn't see early ability to identify and classify, and he learned the alphabet as a late 2, maybe 3? I thought he might be mildy gifted at most until he learned chess at age 3 and began reading well before age 4.
This is quite interesting. I don't think "early ability" means "higher ability" for all kids. My DS was like your DD, he was just so advanced in everything at such an early age it was freakish indeed. DD on the other hand never showed any amazing signs. Then suddenly she took off in music at maybe 5 and is more advanced than DS at the same age. Then she suddenly took off in math in 3rd grade and can cover 3 years of math in each school year without sweat.