Does the soul come back in a new born body?
Yes, but not always, and most times in parts...
In order to understand the process of reincarnation, one must first comprehend the anatomy of the soul as it relates to the Sefirot, the souls emotions aka the divine attributes.
The soul contains 5 level, listed from "lowest" to "highest":
to be continued...i'y'h
Based on the work of the great master Rabbi Haim Vital z"l student of the ninja master Rabbi Isaac Luria z"l