A nurse is providing anticipatory instructions to the parents of a toddler regarding car seat safety. Which of the following statements suggest that the parents need more instruction?

"The harness straps should be at or above the child's shoulders and snug enough that you cannot pinch any slack."

The car seat should be placed in the middle of the back seat for optimal safety."

"Always check that the car seat is properly secured before every trip.

It's okay to place thick padding or blankets under the child in the car seat for extra comfort."