St. Justin Martyr makes this argument in ~160 A.D. You assert that the Scripture is not as they have expounded it, but says, ‘Behold, the young woman shall conceive,’ as if great events were to be inferred if a woman should beget from sexual intercourse: which indeed all young women do, with the exception of the barren. (Dialog with Trypho Chapter 84) St. Irenaeus also discusses it in ~180 A.D. For what great thing or what sign should have been in this, that a young woman conceiving by a man should bring forth—a thing which happens to all women that produce offspring? But since an unlooked-for salvation was to be provided for men through the help of God, so also was the unlooked-for birth from a virgin accomplished; God giving this sign, but man not working it out. (Against Heresies Book III Chapter 21 Paragraph 6) Tertullian also makes this argument in ~198 A.D. You have the audacity to lie, as if the Scripture [said] that not a virgin, but a young female, was to conceive and bring forth; you are refuted even by this fact, that a daily occurrence—the pregnancy and parturition of a young female, namely—cannot possibly seem anything of a sign. And the setting before us, then, of a virgin-mother is deservedly believed to be a sign. (Answer to the Jews Chapter 9) Origen also discusses this, with a longer argument, in ~248 A.D. Now, if a Jew should split words, and say that the words are not, Lo, a virgin, but, Lo, a young woman, we reply that the word Almah—which the Septuagint have rendered by a virgin, and others by a young woman—occurs, as they say, in Deuteronomy, as applied to a virgin, in the following connection: “If a damsel that is a virgin be betrothed unto an husband, and a man find her in the city, and lie with her; then you shall bring them both out unto the gate of that city, and you shall stone them with stones that they die; the damsel, because she cried not, being in the city; and the man, because he humbled his neighbour’s wife.” And again: “But if a man find a betrothed damsel in a field, and the man force her, and lie with her: then the man only that lay with her shall die: but unto the damsel you shall do nothing; there is in her no sin worthy of death.”
But that we may not seem, because of a Hebrew word, to endeavor to persuade those who are unable to determine whether they ought to believe it or not, that the prophet spoke of this man being born of a virgin, because at his birth these words, God with us, were uttered, let us make good our point from the words themselves. The Lord is related to have spoken to Ahaz thus: “Ask a sign for yourself from the Lord your God, either in the depth or height above;” and afterwards the sign is given, “Behold, a virgin shall conceive, and bear a son.” What kind of sign, then, would that have been—a young woman who was not a virgin giving birth to a child? (Contra Celsus Book I Chapters 34-35)