I never heard of the Ruf estimates when my DD was that young. She was so active that mostly I was just trying to keep her out of the emergency room. My F-I-L used to say she was one of those children who, in olden times, would have come to a horrible end in the shuffle of old fashioned kitchens and bustling houses with lots of kids in them.
We mostly had board books because she put everything in her mouth! I do remember that when she was about 16 months I had to buy a book to replace a paper-paged library book about butterflies she had ripped, and not because she was careless but because she was so enthusiastic, when she tried to turn the pages she was so excited to get to the next page they tore.
Does that count toward a level of giftedness?! (lol)