So what did the «firstborn of all the livestock» do to prevent the freedom of the jews and why did he allow their murder? (redeeminggod.com)
I was told that I would be a worthy daughter by playing the role of firstborn son. (rachelheldevans.com)
Accordingly, parents and researchers alike often portray the birth of a sibling as a stressful life event — a crisis, even — for firstborn children (Volling 2012). (psychologytoday.com)