Yeshua was born under exactly what every other person that ever lived was born under.
Your statement to the contrary is theology, not the word of God.
Grace was for Adam and all of his descent. Nobody was ever born “under” grace. Grace is not a requirement under which one can be born. The requirement for every man ever born on Earth is spelled out in Ecclesiastes 12:13.
Nothing in scripture says that anyone can find the righteousness needed for justification by following that requirement, nevertheless it is required of all.
Those that think that they can “believe” in Yeshua and dismiss his demands of us is in for a rude Matthew 7:23 awakening at the Great White Throne of Yeshua.
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Jesus was born under the law and subject to it.
Galatians 4:4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
We are NOT under the law.
Romans 6:14 For sin shall not have dominion over you: for ye are not under the law, but under grace.
Galatians 3:23 Before the coming of this faith, we were held in custody under the law, locked up until the faith that was to come would be revealed.
The law was a tutor or guardian but we are no longer under that tutor.
Galatians 3:25 But now that faith has come, we are no longer under a tutor.
But I suppose if you are not led by the Spirit you would still be under the law and feel a need to teach it.
Galatians 5:18 But if ye be led of the Spirit, ye are not under the law.
I pray that one day soon you will put your faith in Christ who redeemed us from the law.
Galatians 4:4 To redeem them that were under the law, that we might receive the adoption of sons.
That in fact is the word of God.