The Apgar score is a method to quickly assess the health of newborn babies. It is measured at 1 minute and 5 minutes after birth, and potentially again at 10 minutes. The score considers five factors: heart rate, breathing effort, muscle tone, skin color, and reflex response. Higher scores indicate healthier babies, while lower scores may require medical intervention or resuscitation. The Apgar score was developed in 1952 by Dr. Virginia Apgar to standardize the evaluation of newborns' condition after delivery.