Do you know the difference between soul and spirit? Do you know how people are conceived? Lord Jesus had brothers. They were were conceived by Joseph's sperm. Lord Jesus was not. He was conceived by the Holy Spirit. Physically, He had a human body that needed to eat, drink, could bleed and even be killed. His nature was God, not man. Lord Jesus had life in himself. No one else could claim that, including Adam. The life that Jesus has is the uncreated life of God.
God sent His Son, Jesus Christ, in the likeness of sinful flesh.
Romans 8:3
3For what the law could not do, in that it was weak through the flesh,
God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:
Adam was called the son of God because he was directly formed by God and not descended from any other being. Sorry about that, evolutionists. Adam was not sinful, but neither was he righteous. He had natural life, not spiritual life. God gave Adam the opportunity to receive spiritual life, but of course he chose to rebel instead.
Okay, well Adam and Eve were created perfect. Doesn't perfect God create perfect things? Yet they sinned anyway. Jesus Christ, in the flesh, had the capacity to sin, hence why He was able to be tempted in the desert by Satan, hence why He prayed for the "cup to pass from me", because Christ came in the likeness of sinful flesh according to Romans 8:3.
Of course Christ never sinned, but He was tempted in every way.
Hebrews 4:15
15For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as
we are, yet without sin.
God can't be tempted with evil, but flesh can be tempted with evil.
My point is that if flesh can sin, and Christ never sinned even as a baby, then no babies sin.
There are three words in Greek that English translates "life". They are "bio", "Pseuche" and "Zoe". Pseuche refers to the realm of the soul, where we derive our word psychology. Bio refers to the physical. Zoe refers to spiritual life, the uncreated life that is God Himself. Lord Jesus came that we might have "zoe" life. He said, "He who seeks to save his pseuche will lose it". What we gain when we lose the soul-life is God's eternal life instead.
I haven't really studied those Greek words but that seems to jive well with what I believe.