Reply To: Now, that’s Jewish(?)

I did not see any reason for the red string. I can give you a reason on my own. Young children get punished because of the parents sins. So we making a proclamation by placing the red string (which symbolizes sin) on our children indicating that we deserve to be punished, so have mercy on our children. This is based on the pasuk אם יהי-ה חטאיכם כשנים כשלג ילבינו if you see your sins red ike red strings, they will turn white like snow.