My almost-three-year-old makes me laugh. Some of his phrases that may forever be in our vernacular:
"It's a wot of dark." Yes, he does specify between 'a wittle dark' and a lot.
"It's bewwy gwass." (It's very glass) Used to indicate that something is breakable.
We also had to ask him today what his sister's name is. He said, "Brook-Brook." Hrm. Suppose we should call her by her full name more?