Final answer:
The MMR vaccine should be withheld for immunocompromised infants.
Step-by-step explanation:
The MMR vaccine is composed of live viruses and is contraindicated for an infant who is immunocompromised. Therefore, the nurse should withhold the MMR vaccine for immunocompromised infants. Giving the MMR vaccine to immunocompromised infants can potentially cause severe complications because their weakened immune systems may not be able to handle the live viruses in the vaccine. It is important to protect the health and well-being of infants who are already vulnerable due to their compromised immune systems.