Final answer:
Accidents are the leading cause of death and injury in this age group.
Step-by-step explanation:
The most important teaching to include during this clinic visit is that accidents are the leading cause of death and injury in this age group. As toddlers begin to explore their world, they may engage in activities that could put them at risk for accidents. It is crucial for parents to take necessary precautions to create a safe environment for their child. This includes childproofing the home, closely supervising the child, and providing appropriate toys and activities that are suitable for their age.