Genesis 38:29 - Verse of the Day

Genesis 38:29  And it came to pass, as he drew back his hand, that, behold, his brother came out: and she said, How hast thou broken forth? this breach be upon thee: therefore his name was called Pharez.

One could say the Lord clear chose this child as first born as he is mentioned in The Line to Jesus.

Matthew 1:3  And Judas begat Phares and Zara of Thamar; and Phares begat Esrom; and Esrom begat Aram;

But I doubt it matters whether he was first born as much as he was born.
Perhaps it was more important that she fulfilled what was right to happen.

Genesis 38:26  And Judah acknowledged them, and said, She hath been more righteous than I; because that I gave her not to Shelah my son. And he knew her again no more.

Genesis 38:29

And it came to pass as he drew back his hand,.... Into the "uterus" again:

that, behold, his brother came out; out of his mother's womb, and so was properly born first:

and she said; either Tamar, or rather, her midwife:

how hast thou broken forth? it was astonishing to her how it could be, having never met with the like in her practice before; she could not imagine how it was possible for him to come forth first, when his brother lay in the way of him, and nearest the birth, as appeared by his putting out his hand:

this breach be upon thee; if any damage comes either to the mother or to the brother, and so carries in it the nature of an imprecation; or rather, that the memory of so strange an event might be preserved, she imposed a name on him that should continue it:

therefore his name was called Pharez: or "therefore he called", &c. (k); Judah called his name Pharez, agreeably to what the midwife had related. From him, in a line of succession, sprang the Messiah, the Pharez or breaker, Mic 2:13; for the sake of which the whole history of this chapter seems to be recorded, Mat 1:3.

(k) ויקרא "vocavit", Pagninus, Montanus; "ideoque vocavit", Junius & Tremellius, Piscator, Schmidt.