William spent his first nine months aerobicizing in my belly and the next nine steadily growing out of the Bjorn. It wouldn't be such a big deal if Will could be restrained with any other contraption, but he quickly tires of the high chair, the car seat and the jumperoo. He doesn't mind the stroller, but around the house we are harrassed with the "UP!" grunts and sign language unless we lift him up to our level.
I can no longer cart him around in the carrier (have you seen the Boost Mobile commercial in which an older man is carrying a younger and fully-grown man in a Baby Bjorn? That is what it looks like when I try to strap Will to my body. It is ridiculous and not my back's favorite activity), but he still goes for a ride with Dave on occasion: