A nurse is reinforcing teaching with new parents about car seat safety. Which of the following instructions should the nurse include?

The shoulder harnesses of the car seat should be adjusted to fit the infant properly. The straps should be positioned at or below the level of the infant's shoulders to ensure a secure fit and proper restraint. Infants should always be placed in a rear-facing car seat in the back seat of the vehicle. If the car seat is placed in the front seat, the airbag should be turned off to prevent potential harm to the infant in case of airbag deployment. Do not put a small cushion under the newborn's head for support: It is important to follow the manufacturer's guidelines for the specific car seat being used. Additional cushions or supports should not be added to the car seat as they can interfere with the proper fit and safety of the seat. The infant's head should be supported by the car seat itself. Infants should be placed in a rear-facing car seat at a reclined angle of approximately 45 degrees. This helps to keep the infant's airway open and provides proper support for their head and neck.