Watch this video to learn about APGAR score. Appearance, Pulse, Grimace, Activity, Respiration are the five core elements of this score. Apgar score is usually calculated 1 min after birth so that doctors can assess how the neonate performed in the body of mother and during labor, and after 5 minutes (to assess the response to efforts of resuscitation).
The link to the video isn't working (at least not for me).