Final answer:
A pregnant client may need further instruction if they do not understand the importance of avoiding behaviors that can harm the fetus.
Step-by-step explanation:
When teaching pregnant clients about behaviors to avoid during pregnancy, a registered nurse should provide comprehensive information. However, further instruction may be needed if the client does not understand the importance of avoiding certain behaviors. This could include behaviors such as consuming alcohol, smoking, and using illicit drugs, which can all have harmful effects on the fetus. Additionally, the client may need further instruction if they are unaware of the risks associated with certain foods, such as raw or undercooked meats, unpasteurized dairy products, and certain types of fish that may contain high levels of mercury.