Final answer:
The carotid artery should not be used as an injection site when embalming a newborn infant due to its delicacy and proximity to vital structures. Alternative sites like the femoral artery are preferred.
Step-by-step explanation:
The injection site that should NOT be used when embalming a newborn infant is the carotid artery. The carotid artery is very delicate in infants and is in close proximity to other vital structures which increases the risk of complications during the embalming process. Moreover, because of the size of the infant's vessels, other options like the femoral artery are preferred due to easier access and reduced risk.
It's important to note that the question elements regarding blood vessels like the common carotid artery, jugular vein, internal carotid artery, and the aorta provide context to vascular anatomy relevant to embalming. The common carotid artery and the internal carotid artery play important roles in supplying the brain with fresh, oxygenated blood, but are not ideal injection sites in newborn infants for embalming.