Answer 3 Of 7: Not Correct

The question was: Which principle did the Romans use for number names like Quintus (the 5th) and Sesto (the 6th)?

Answer 1: According to birth weight in pounds

Answer 2: According to size/height of the baby in an old Roman measure

Answer 3: For the n-th child of a family or a child born in the n-th month of the calendar

Answer 4: For a child born in the n-th hour of the day