Ladies with toddlers age 3 and up.. what did you do when your toddler learned to open and close carseat chest latch? My 3 yr old keeps opening the thing that goes over his chest and I dont know what to do, he wont listen to me. My mom suggested duct tape over it but then how would i open it? Please i need help!

I forgot to mention its a Graco extendtofit convertible carseat.