Brooke has been very into the concept of counting. We count things with her often, generally up to the number three. She likes to count things on her own, but usually just points out things and says "one". Then she mumbles other random things for the other numbers, or just gives up counting after that :)
Occasionally she says "one, two" depending on her mood or how excited she is about counting. If we ask her to repeat us, she can easily says "one, two, three", but I had assumed that it was a little beyond her and have not tried to push her in any way.
This morning we went to Starbucks. We let Brooke walk (versus taking the stroller), and it must have been the longest walk we have ever taken. Brooke had to stop to smell every flower, point at every car, and step on every item she saw. At one point she found a short wooden picket fence, with each picket being about as tall as her chest. She touched each one as she walked and counted "one". She kept repeating "one" as she went along ;) I gave her a little help and started counting for her "one, two, three" and then started over at one again. She listened to me talk as she touched each one and walked along. The next house had wooden paneling on the front.
Brooke walked up to the paneling, touched the first one and said "one"
She moved onto the next one and said "two"
And moved onto the next one and said "three"
Before you know it we will have her working on her addition, subtraction and multiplication tables ;)