Kekoa's long sentence

"Vans no baba, change the poo poo diaper" (Van said I don't want to have my diaper changed daddy)

Kekoa couldn't stop saying this over and over again tonight, as I was trying to get him to go to sleep.
What does this exactly mean? Well, we went over to Van's house this afternoon for some fun.
As the two boys were playing trains, Van was going #2. He was making little grunting noises and when he was done, it was time to change the pamper. Van didn't want to leave all the fun and didn't leave for his pamper change without a little kicking and screaming.
So, this evening, Kekoa replayed the whole incident. Told me how Van was going poo poo (even made the same grunting noises). Told me how "Van crying" and then "Vans no baba, change the poo poo diaper" Kekoa couldn't stop telling me the story. I was trying so hard not to laugh, especially when Kekoa made the same grunting noises.
He had a great time at Van's and can't wait to go back to play!