For decades, not much has changed in the basic way convertible car seats work—they’re installed rear-facing or forward-facing, and they stay in that position until you move them. But recently, a growing number of models offer a new feature: rotation.The idea is that a caregiver can rotate or swivel the car seat towards the door to help get a squirmy, resistant kid settled, and then rotate the seat back to a rear- or, in the case of some seats, forward-facing position for the ride. When it’s time to take the child out of the car, caregivers again rotate the seat towards the door and unbuckle the child.It may sound convenient, but after trying four rotating car seats, we’ve concluded that the seats themselves are more complex, less straightforward to install, and have more things that can go wrong than conventional models. Plus, they’re much more expensive than regular convertible seats from the same brands and, generally, heavier.