Why is the Apgar Score done twice?

Developed in 1952 by anesthesiologist, Virginia Apgar, , the APGAR Score checks the newborn's Activity level, Pulse, Grimace, Appearance, and Respiration at 1 minute and 5 minutes after birth.

At the moment of delivery, many newborns can often appear dusky or have a lower than normal APGAR. Usually, the low scores begin to come closer to normal by 5 minutes. A baby's skin color improves, for example, as the lungs fill with air and the baby's circulatory system takes over and normalizes. The test can be repeated if needed. A baby may be more listless because of sedation given to the mother, but with stimulation, the baby becomes more responsive.

Obviously, a very low APGAR at 1 minute would mean doctors and nurses would be intervening and treating symptoms, as appropriate.