A nurse is reinforcing instructions about car-seat use with the parents of a newborn who is preparing for discharge. Which of the following Instructions should the nurse include?

"Swaddle the newborn before securing the clips."

"Add a soft head support in the car seat if necessary."

"Secure the straps across the newborn's chest at the level of their armpits."

"Ensure that the car seat is positioned at a 90 degree incline.”