LOL, the fact is, the very context of the prophecy of Immanuel in Isaiah 7 reveals that it had two fulfillments, the first being through Isaiah's son and his birth and name was a sign and message to Judah and Jerusalem that the two Kings who were plotting against them as per the beginning of the chapter would not succeed because "GOD WAS WITH THE PEOPLE OF JUDAH AND JERUSALEM".
Of course this also had a fulfillment in the birth of Jesus, for God was with us through Jesus being he would die for our sins to bring us back to God from our sins.
Do you want proof of this, then read on in chapter 8 verse 10, here I will even post it for you.
Notice also the subtitle from the NIV translators, for even they saw this to be the truth about this prophecy.
Isaiah 8
New International Version
Isaiah and His Children as Signs
8 The Lord said to me, “Take a large scroll and write on it with an ordinary pen: Maher-Shalal-Hash-Baz.”[
a] 2 So I called in Uriah the priest and Zechariah son of Jeberekiah as reliable witnesses for me. 3 Then I made love to the prophetess, and she conceived and gave birth to a son. And the Lord said to me, “Name him Maher-Shalal-Hash-Baz. 4 For before the boy knows how to say ‘My father’ or ‘My mother,’ the wealth of Damascus and the plunder of Samaria will be carried off by the king of Assyria.”
5 The Lord spoke to me again:
6 “Because this people has rejected
the gently flowing waters of Shiloah
and rejoices over Rezin
and the son of Remaliah,
7 therefore the Lord is about to bring against them
the mighty floodwaters of the Euphrates—
the king of Assyria with all his pomp.
It will overflow all its channels,
run over all its banks
8 and sweep on into Judah, swirling over it,
passing through it and reaching up to the neck.
Its outspread wings will cover the breadth of your land,
Immanuel!”
9 Raise the war cry, you nations, and be shattered!
Listen, all you distant lands.
Prepare for battle, and be shattered!
Prepare for battle, and be shattered!
10 Devise your strategy, but it will be thwarted;
propose your plan, but it will not stand,
for God is with us
(el immanu = God is with us).