Final answer:
A decreased blood pressure is not a typical physiological indicator of pain in an infant. Indicators such as increased heart rate, facial grimacing, and crying are common signs of pain. Therefore, the correct option is a,c,d.
Step-by-step explanation:
When assessing the pain level of an infant, certain physiological indicators are typically observed. An increased heart rate, facial grimacing, and crying or fussiness are common indications of pain. However, a decreased blood pressure is not typically a physiological indicator of pain and is therefore not a typical finding when an infant is in pain. The sympathetic fight-or-flight response is expected to cause an increase in blood pressure, rather than a decrease.