and how did it come about. We have the following to use as base for this discussion...

Man and woman were made in the image of God with individuality, the power and freedom to think and to do. Though created free beings, each is an indivisible unity of body, mind, and spirit, dependent upon God for life and breath and all else. When our first parents disobeyed God, they denied their dependence upon Him and fell from their high position under God. The image of God in them was marred and they became subject to death. Their descendants share this fallen nature and its consequences. They are born with weaknesses and tendencies to evil. But God in Christ reconciled the world to Himself and by His Spirit restores in penitent mortals the image of their Maker. Created for the glory of God, they are called to love Him and one another, and to care for their environment.—Fundamental Beliefs, 7

Adam's descendants share the sinfulness of his nature. In prayer, David said, "In Your sight no one living is righteous" (Ps. 143:2; cf. 14:3). "'There is no one who does not sin'" (1 Kings 8:46). And Solomon said, "Who can say, 'I have made my heart clean, I am pure from my sin'?" (Prov. 20:9); "There is not a just man on earth who does good and does not sin" (Eccl. 7:20). Job exclaims, "'Who can bring a clean thing out of an unclean? No one!'" (Job. 14:4). David said, "Behold, I was brought forth in iniquity, and in sin my mother conceived me" (Ps. 51:5). The New Testament is equally clear, stating that "all have sinned and fall short of the glory of God" (Rom. 3:23) and that "if we say we have no sin, we deceive ourselves, and the truth is not in us" (1 John 1:8). And Paul stated that "the carnal mind is enmity against God; for it is not subject to the law of God, nor indeed can be. So then, those who are in the flesh cannot please God" (Rom. 8:7, 8).

So if man, though created perfect and in God's image, and placed in a perfect environment, through Adam and Eve became transgressors of Gods Law and inherited sin, how did Jesus who became fully flesh, not have sin at birth.