Final answer:
Children are more prone to frequent acute otitis media due to shorter eustachian tubes, immature immune systems, and bottle feeding while lying down.
Step-by-step explanation:
The nurse explains to the parent of the preschool-aged client that the child is more prone to frequent acute otitis media due to several factors. Children have shorter eustachian tubes than adults, which can lead to fluid accumulation in the middle ear. This fluid offers an ideal environment for microbial growth and secondary bacterial infections. Young children also have immature immune systems, making them more susceptible to infections. Additionally, bottle feeding while lying down can contribute to the risk of otitis media as the sucking action creates negative pressure in the eustachian tubes, promoting the movement of fluid and bacteria from the nasopharynx.