You've gotta keep things fresh. Especially when it comes to your kids. We're talking on a micro level here. You want a happy baby for an hour? You have to switch things up a bunch of times in that hour. This is one of the reasons not too many people are buying a subscription to the Economist for a 1st birthday present.
People are realizing, though, that the Willa Walker is yet one more tool for a parent to keep a child engaged. Going for a long hike? Want to let the kid walk some, ride some, and Willa Walk some? You can. Willa Walker helps make hikes happier for parents and babies.