Final answer:
Behavioral characteristics indicating pain in infants, toddlers, and preschoolers include decreased crying and agitation, and holding a painful body part.
Step-by-step explanation:
When it comes to indicating pain in infants, toddlers, and preschoolers, both behavioral and physical characteristics can be observed. Behavioral characteristics that may indicate pain in this age group include decreased crying and agitation, and holding a painful body part. On the other hand, physical characteristics such as elevated blood pressure and decreased heart rate do not generally indicate pain in young children.