Chatting with my Child

Me: Koby, how old are you?
Koby: ten(giggling)
Me: Koby you are not Ten...How old are you?
Koby: Bubble(giggling)
Me: Bubble is not an age child, how old are you Koby?
Koby:(now laughing hard)Off
Me: NO...you are 1...
Koby: (Now serious)...Por(while holding his little fingers up on his right hand with his little thumb tucked in)
Me: Yes, you are four(while laughing because he was clearly offended by my saying he was 1!)