"Although Kate apparently suspected it was a boy and had set her heart on the name Alexander, they had not yet decided what to call their firstborn.”

Source: https://www.mirror.co.uk/news/royals/kate-middleton-admits-big-pressure-30797768

As firstborn sons of leaders of their two nations, Sokka and Zuko must try to show that they’re capable of taking their fathers’ place once they inherit the leadership.

Source: https://www.cbr.com/avatar-the-last-airbender-why-sokka-zuko-pairing-better-than-mai/

Gwyneth and Chris’ firstborn Apple came into the world on May 14, 2004, with an original celebrity baby name that made headlines.

Source: https://hollywoodlife.com/feature/gwyneth-paltrow-children-4564257/

Her firstborn had to be hand raised by zookeepers because Zoe was unsuccessful in nursing him.

Source: https://boingboing.net/2023/04/07/new-mom-zookeeper-teaches-orangutan-how-to-breastfeed.html

In February during her Super Bowl performance she announced she was expecting her second child, just nine months after giving birth to her firstborn.

Source: https://newsday.com.ng/rihanna-flaunts-sweet-baby-bump-in-lingerie-for-sultry-photoshoot/?utm_source=rss&utm_medium=rss&utm_campaign=rihanna-flaunts-sweet-baby-bump-in-lingerie-for-sultry-photoshoot

In Hobert hails Alicent's firstborn as "Aegon the Conqueror-Babe, Second of His Name!

Source: https://gamerant.com/house-of-the-dragon-house-hightower-explained/

Malith is the firstborn of three children and believes he inherited the height from his grandfather, whom he has now beaten.

Source: https://www.eyeradio.org/meet-malith-dak-the-tallest-south-sudanese-alive/

Not only did John gift his surrogate firstborn Lee's old cabin on the Dutton land, but John's love for his new son-in-law rivaled that of his love for his own children.

Source: https://collider.com/what-happened-to-lee-dutton-yellowstone/

The seemingly mismatched union between Connor, the hapless, oft-forgotten firstborn Roy and his fiancée Willa, a former escort-turned aspiring playwright may be the healthiest partnership on the show.

Source: https://time.com/6265389/succession-toxic-couples-season-4/

They will naturally demand that Aldean attend a re-education camp, give up his left kidney, and sacrifice his firstborn to Molech to atone for his sin.

Source: https://pjmedia.com/news-and-politics/lincolnbrown/2023/07/22/weekend-parting-shot-laughing-the-woke-away-n1712732

To commemorate the birth of his firstborn son, Messi got Thiago's handprints and name tattooed on his left calf, which also happens to be his dominant leg.

Source: https://www.popsugar.com/celebrity/lionel-messi-kids-48075930