Final answer:
The parent's statement suggesting they stopped using a car seat now that their child is older indicates a need for more instruction on accident prevention and car seat guidelines.
Step-by-step explanation:
The statement by the parent that would indicate to the nurse that they need more instruction regarding accident prevention is: "We stopped using the car seat now that my child is older." This statement raises a red flag as it suggests a lack of understanding that a 2-year-old should still be using a car seat for safety reasons. It is important for parents to know that children typically need to use a car seat until at least age 5 or when they reach the size requirements for a booster seat.