Counting.

A few weeks ago, Teresa started using 'one' and 'two'... 'One more book' etc. This quickly became 'one two three'. They say this at day care before they go outside, apparently. She quickly went from one to six (seven was hard), but if you gave her seven she'd get eight, and if you gave her nine, she'd get ten. Now she goes all the way to nine or ten without any help at all!