Sanhedrin 91b:

Antoninus asked Rabbi, "At what time does the impulse to evil gain mastery over man: at the time of his conception or at the time he is born?"

Rabbi: "At the time of his conception."

Antoninus: "If so, he would have kicked his way out of his mother's womb. Accordingly, the impulse to evil must gain mastery at the time of birth."

Subsequently, Rabbi used to say: This is one thing that Antoninus taught me, and Scripture supports him, for it is said,
"At the door [through which the newborn child issues], sin crouches" (Bereishit 4:7).