Two Fingers

We have been talking to Aidan about his birthday coming up soon. When we ask him if he is going to have a party he will say "birthday party!" and if we ask him how old he will be he says "two fingers!". It started when PaPa Smith asked him how old he was going to be and held up two fingers to ask how old he would be and he answered "two fingers". And when we would ask him recently and would hold up two fingers, he would answer the same way!