Final answer:
The common site for a capillary puncture in infants is the heel, specifically the medial or lateral side.
Step-by-step explanation:
The typical site for a capillary puncture on an infant is the medial or lateral side of the Heel. This procedure, known as a heel stick, is often used to collect a small amount of blood for various tests that are necessary during the first days of life. The fingers, earlobes, and toes are not commonly used for capillary punctures in infants due to differences in anatomy and risks associated with puncturing these areas in such young patients.