Q:

Why Karn Chhedan sanskar is required?

There are 16 sanskar in Hinduism in which 9th sanskar is Karn Chhedan. Why is it required ? I googled and found it is done for good health. Can anyone explain it logically. I don't see it relatable.

A:

Why Karn Chhedan is  required ? 
Sushruta Samhitavolume 1: - Chapter XVI - Puncturing and Bandaging the ear - Karna-Vyadha-Vandha-Vidhi-adhyaya.Provides us some explanation.

The lobules of the ears of an infant are usually pierced through for protecting it (from the evil influences of malighant stars and
  spirits) and for the purposes of ornamentation as well. The piercing
  should be performed on a day of bright fortnight marked by the
  auspicious lunar and astral combinations, and in the sixth or the
  seventh month of the year reckoned from its beginning (Bhadra). The
  child should be placed on the lap of its nurse, and benedictions
  should be pronounced over it. Then having soothed it and lured it with
  toys and playthings, the physician should draw down with his left hand
  the lobules of its ears with a view to detect, with the help of the
  reflected sun-light, (the closed up) apertures that are naturally
  found to exist in those localities. Then he should pierce them
  straight through with a needle held in his right hand.

