“After the normal nine-month gestational period, Christ was born at the beginning of the tenth, in accordance with the law of gestation. It was the birth that surpassed the established order of birthgiving, as it was without pain; for, where pleasure had not preceded, pain did not follow. And just as at His conception He had kept her who conceived Him virgin, so also at His birth did He maintain her virginity intact, because He alone passed through her and kept her shut [Ezekiel 44:1-3].
While the conception was by ‘hearing’, the birth was by the usual orifice through which children are born, even though there are some who concoct an idle tale of His being born from the side of the Mother of God. For it was not impossible for Him to pass through the gate without breaking its seals. Hence, the Ever-Virgin remained virgin even after giving birth and never had converse with a husband as long as she lived.”
+ St. John of Damascus, Exposition of the Orthodox Faith, Bk. 4, Ch. 14