As Paul indicates, "Therefore, just as through one man sin entered into the world, and death
through sin, and so death spread to all men, because all sinned— "
(Rom 5:12). The fact that infants die confirms the imputation
of Adam’s sin as Paul elaborates further, "Nevertheless death reigned from Adam until Moses, even over those
who had not sinned in the likeness of the offense of Adam, who is a type of Him who was to come."
Hereditary / Inherited Sin
The forbidden fruit corrupted Adam and Eve's human nature which was passed down to subsequent
generations. Paul refers to his human nature and his natural inclinations as "sin which dwells in me."
"So now, no longer am I the one doing it, but sin which dwells in me. For I know that
nothing good dwells in me, that is, in my flesh; for the willing is present in me, but the doing of the good is
not. For the good that I want, I do not do, but I practice the very evil that I do not want. But if I am doing
the very thing I do not want, I am no longer the one doing it, but sin which dwells in me."