Turns out that Lewis absolutely LOVES riding in E's babydoll stroller!
He gets in the stroller on his own and she runs through my house, full speed, and he makes no attempt to get out of the stroller.
When he wants to ride in it, he goes up to the back side of it, stands up on his hind legs and pushes the stroller across the room until it runs into something.
I'm not sure who is having more fun --"E" or Lewis?!?!??