Signs that the three year old is maturing....
When she no longer calls him "Lady-Pooh".
He is now "Windy-Pooh".
I remember when No. 3 used to call a "knife" a "life". It was so adorable that I just couldn't correct her. Same with this Lady-Pooh thing. I just couldn't tell her she was saying it wrong. I knew she would figure it out when she got old enough to hear the difference. *sigh*
Thankfully, No.5 still says "cool" for "pool". But I'll be willing to bet that by the middle of the summer, she will self-correct that bit of innocent sugar-sweetness, too.