general problems of the 2011 Toyota Sequoia

My children (5 and 6 years old) were in the third row seat in backless booster seats with seatbelts on. After pulling out of a parking lot onto the main road, I heard my 5 year old screaming from the back of the car. My 6 year old (who remained in his booster with the seatbelt fastened), managed to push the button near the side door to raise/lower the seat in the third row. As he did this, my 5 year old's head became wedged between the third row seats. I pulled over and gained access to him from the rear hatch. The seat would not move back anymore for me to get his head out. I had to force his head out with my hands. He has some serious bruising on the side of his face. After the incident, I could not find any way to disable their seat controls (like I can for the windows) to prevent this from happening again. It was very scary and I can only hope that Toyota will be able to address this safety issue in the future.