The nurse is planning to teach infant care and preventive measures for sudden infant death syndrome (SIDS) to a group of new parents. Which information is most important for the nurse to include?

A. Ensure that the infant's crib mattress is firm. Rationale: A firm mattress reduces the risk of SIDS as it prevents the infant's face from sinking into the mattress, which could obstruct breathing. B. Prop the infant with a pillow when in a side-lying position. Rationale: Pillows should not be used with infants due to the risk of suffocation and increased risk of SIDS. C. Swaddle the infant in a blanket for sleeping. Rationale: While swaddling can be comforting, it should be done correctly to avoid too tight swaddling, which can lead to overheating, another SIDS risk factor. D. Place the infant in a prone position whenever possible. Rationale: Infants should be placed on their backs to sleep, not on their stomachs, as back-sleeping is associated with a decreased risk of SIDS. Prone sleeping positions are discouraged.