The Human Spirit is that spirit that enters the body of an unborn child just before it is born. It is said that when the child first moves in the womb that is when the spirit enters the child.
That same spirit will leave the body at death and return to that home from where first came to await the resurrection, when it will be reunited with that same body. The body and spirit having fulfilled its purpose here on earth.
Human spirit is inspired soul.
When a child is born, the body is devoid of soul and spirit.
However, the child is born with God's gift of ability to think, feel and act.
With the Holy Spirit residing in the body, the child begins to fill its own soul and later, its spirit out of the soul.