These seats have been designed specifically with the Babboe cargo bike in mind, they increase stability. The little kid seat is a great transition from being in the toddler seat to sitting independently on the bench. The little kid seat fits all cargo bike models. Two can easily sit next to one another in a Babboe Big or Dog. It doesn't fit in the City, Curve, Go, Carve, Flow and Mini, because of either the rounded corners or box size. But, of course, a single little kid seat does fit in all these models. The Babboe Big can hold a little kid seat alongside a baby or toddler seat.