How can I tell if my child is too tall for their Radian car seat?

Once the top of the child's ear are over the top of the back of the seat or if you're using the 5-point harness once the harness straps begin to go below the shoulders.

If you’d like to find out more about the Diono Radian 3R visit our store: https://store.diono.ca/radian-3r/