I have horrifying news.
WCB has learned how to climb the stairs.
At first, she'd just climb the first three stairs and then hang out on the landing for a while. This morning, however, she made it all the way to the second floor. This is no small feat. We have a pretty tall, steep stairway. Somebody her size sitting at the bottom of those stairs and looking up probably thinks they look like this:
And yet she made it to the top without Sherpa guides.