Baby Steps

Baby Steps is the second half of the 4th episode of Season 16. It aired on October 18, 2012 along with "Get Smart".

Synopsis
Mei Lin can say "hello" AND play the piano?!? Kate can't even wave! Worried about her sister's future, D.W. enlists the help of Brain to determine if Kate is above average, below average, or (gulp!) just average-average...Meanwhile, Kate and Pal are puzzled by D.W.'s odd behavior and vow to find a "cure."

Trivia

 * In "Mei Lin Takes a Stand", Kate is the one who is more advanced and growing up faster. In this episode, it is the total opposite.
 * Just like in "Breezy Listening Blues," Brain's intelligence test is to fit different shapes into the correct holes. But this time, he acknowledges that one test is not enough for a final conclusion.
 * Kate imagines herself as a teenager differently than in "Paradise Lost."
 * When Kate is a teenager, she still is wearing her baby bow and has not a lot of hair. She would have grown more hair, and probally would have taken off the bow in real time.
 * D.W. calls Arthur a "broken baby", referring to "D.W.'s Time Trouble".