Final answer:
Finger sticks should not be performed on children younger than 2 years old due to their small fingers and fragile blood vessels.
Step-by-step explanation:
The subject of this question is Health and the grade level is Middle School. Finger sticks should never be performed on a child younger than 2 years old. This is because infants and very young children have small fingers that may be more sensitive and vulnerable to injury. Additionally, their blood vessels may be too fragile to withstand the procedure. It is important to use alternative methods for collecting blood samples, such as a heel stick or venipuncture, which are more appropriate for younger children.