Reply To: Now, that’s Jewish(?)

I found the source for the red string. For Yehuda’s sons, to know who came out first, the midwife tied a red string on him.

ספר בראשית פרק לח כח
וַיְהִי בְלִדְתָּהּ וַיִּתֶּן יָד וַתִּקַּח הַמְיַלֶּדֶת וַתִּקְשֹׁר עַל יָדוֹ שָׁנִי לֵאמֹר זֶה יָצָא
רִאשֹׁנָה

When she gave birth and one stretched his hand out, the midwife took his hand and tied a red string on him to know who came out first.