Final answer:
To collect blood from a ten-month-old infant for a routine CBC, you can collect it from a vein in the arm, preferably the median cubital vein or the back of the hand. Another option is to collect blood from the heel using a lancet.
Step-by-step explanation:
When collecting blood from a ten-month-old infant for a routine CBC, the most common method is to collect the blood from a vein in the arm. The appropriate site for venipuncture in infants is typically the median cubital vein or the back of the hand. The blood can also be collected from the heel using a small lancet to create a puncture.