The Crux of Sin?

St Augustine of Hippo
Unholy saint?

When writing his autobiographical Confessions, St Augustine of Hippo saw “filth” and “the itch of lust” in infants.* He thought babies were “evil” and in his Answer to the Pelagians, he wrote, “Who is clean from filth? Not even an infant who has lived one day on earth.”

Through his teaching Christians learn that their babies are born already stained with original sin from the concupiscence (sexual desire) of Adam and Eve, and infants must be baptised to wash this sin away.

Could some undisclosed or suppressed perversion have led St Augustine to declare he saw lust in infants?