A nurse is teaching about crib safety with the parent of a newborn. Which of the following statements by the client indicates understanding of the teaching?

"I should place my baby's crib next to the heater to keep him warm during the winter."

"I should pad the mattress in my baby's crib so that he will be more comfortable when he sleeps."

"I should remove extra blankets from my baby's crib."

"I will place my baby on his stomach when he is sleeping."