Final answer:
A baby's hearing begins to develop around the 20th week of pregnancy. Playing music or talking to the baby can stimulate their hearing and help with bonding.
Step-by-step explanation:
When counseling Anna on the development of her baby's hearing, you can inform her that a baby's hearing begins to develop around the 20th week of pregnancy. By this time, the structures of the ear have formed and are starting to function. You can explain that playing music or talking to the baby can be a way for Anna to bond with her unborn child and stimulate their hearing.