At birth- first breath
  Inflation of lungs
  Pulmonary
  Vasculature opens
  Increased oxygen saturation
  Greyish newborn
   turns healthy color

Apgar score
Activity (muscle tone, active
    movement)
Pulse (above 100bmp)
Grimace (reflex irritability -
    sneeze, cough,  pulls away)
Appearance (entire body normal
   color)
Respiration (good, crying)

1 point each at 1 and 5 minutes 
Normal  7-10