That’s not what scripture says. Scripture says he was ‘born of a Virgin’. Scripture does not say, “He was the first to be born without sin”.
Remember, there is Adam and Eve, also, who were created by God. They too, were sinless in the beginning, before the Fall.
Remember that Scripture says that Christ was fully God and fully Man? Christ inherited his full human nature from Mary. Given the curse of Adam which runs through each of us, how could he be without sin?
He is without sin because He is God. The better question is ... how could she be without sin?
SnakeDoc
Adam and Eve were created, not born.
SnakeDoc