Why is the Adhan recited in the right ear of a newborn and the Iqamah in the left ear upon birth? Does this symbolize that a person's life is like a prayer without Adhan or Iqamah (like the funeral prayer) to alert them to the obligation of obedience?

The Adhan in the ear of the newborn is recommended. Among its wisdoms is that the first words heard by the child are words of monotheism and glorification, and it involves teaching the rituals of Islam upon entering the world, and it causes the devil to flee, and God's call precedes the devil's call. Some have also mentioned that one of its wisdoms is to draw attention to the short duration of one's stay in this world.