A nurse is reinforcing teaching about crib safety with a group of prenatal clients. Which of the following information should the nurse include in the teaching?

"Use a plastic cover to protect the crib mattress.”

"Place bumper pads securely between the mattress and the rails of the crib."

"Place your newborn on a foam-wedge cushion during naps."

"Ensure that the mattress fits securely against the sides of the crib."