Final answer:
If meconium is passed in utero, the nurse must suction the newborn's mouth and nose before the first breath to prevent complications.
Step-by-step explanation:
If meconium is passed in utero, the nurse must take action to prevent complications in the delivery room. The correct action would be to suction the newborn's mouth and nose before the first breath. Aspiration of meconium with the first breath can cause labored breathing, a barrel-shaped chest, or a low Apgar score. It is important to remove the meconium to prevent further respiratory distress and potential infections.