Final answer:
The nurse would tell the client that the baby's hearing begins to develop around 18 weeks and is well-developed by week 24. The nurse would advise the client to play calming music or sounds to stimulate auditory development.
Step-by-step explanation:
The nurse would tell the client that the baby's hearing begins to develop in the womb around 18 weeks gestation. By week 24, the baby's auditory system is well-developed and can perceive sounds from the external environment. The nurse would advise the client to play calming music or sounds to help stimulate auditory development and provide a soothing environment for the baby.