Baby twins spend their first day apart—and their nighttime reunion melts hearts

The bond between twins is truly one-of-a-kind. It starts in the womb and often lasts a lifetime, shaping who they are and how they connect with others. Known for their inseparable connection, twins frequently share a closeness that’s both fascinating and heartwarming to witness.

A recent viral TikTok video shared by the account @thattwinmama beautifully captures this unique relationship. The video, which has racked up over 13,000 views, shows a pair of twin baby girls experiencing their first day apart—a milestone that many parents of twins might find both exciting and emotional. But it’s what happened later that night that truly highlights their unbreakable bond.

@thattwinmama_ Will forever make me😭… cant think of anything stronger than the #twinbond ❤️ #twinsoftiktok #twins #twinsisters #babylife #twinlove #sisterlove #feelgood #babiesoftiktok #sharethelove #newmom #4u #sistersforever ♬ What Was I Made For? [From The Motion Picture "Barbie"] – Billie Eilish

As their parents tucked them into adjacent cribs, the baby monitor revealed a tender reunion. The twins, unable to resist reconnecting, reached out to each other with sweet gestures. From tiny hands reaching across the crib rails to shared giggles, a gentle kiss on the head here, a comforting back pat there—every action showcased the love and connection they share.

For parents, it’s moments like these that underscore the magic of twin relationships—proof that even during big transitions, their bond provides comfort and security.

The viral video quickly gained attention online, even inspiring coverage from outlets like Upworthy, which highlighted the deep emotional resonance and universal appeal of this tender moment.

Related: New Year’s twins born minutes apart—but on different days, months, and years

The science behind the twin bond

Studies have long highlighted the extraordinary connection between twins. In some cases, even twins raised apart have been found to share uncanny similarities—from their preferences to major life choices—leaving scientists in awe of their innate connection. However, researchers also note that shared environments in early life influence these traits significantly, making each case unique.

Moments like the one captured in this video give us a glimpse into the world of twins—a world built on mutual understanding, unconditional love, and companionship that few others experience.

Fascinating facts about twins

• Twins Begin Bonding in the Womb: Research has shown that twins start interacting as early as 14 weeks into gestation, reaching out to each other and touching head-to-head or arm-to-head.
• Unique Fingerprints: Despite sharing identical DNA, identical twins have distinct fingerprints due to unique environmental factors in the womb affecting their development.
• Twins May Develop Their Own Language: Approximately 40% of twins create a private language, known as cryptophasia, which they use to communicate exclusively with each other during early childhood.
• Higher Twin Birth Rates Today: The likelihood of having twins has increased by 70% over the past 30 years, partly due to factors like maternal age and fertility treatments.
• Twins Can Have Different Dads: In rare cases, fraternal twins can have different fathers, a phenomenon known as heteropaternal superfecundation.

Related: Ohio hospital sees 7—yes, 7!—sets of twins born within days of each other

The bottom line

The connection between twins is nothing short of extraordinary—a bond that begins in the womb and continues to shape their lives in remarkable ways. The viral reunion captured by @thattwinmama is a heartwarming reminder of the unbreakable connection they share, even when faced with new experiences.

Sources:

1. Twins Separated at Birth Reveal Staggering Influence of Genetics. 2024. Live Science. Twins Separated at Birth Reveal Staggering Influence of Genetics.
2. Wired to Be Social: The Ontogeny of Human Interaction. 2010. Plos One. Wired to Be Social: The Ontogeny of Human Interaction.
3. Do Identical Twins Have Identical Fingerprints? Washington State Twin Registry. Do Identical Twins Have Identical Fingerprints?
4. Autonomous Languages of Twins. 2014. Cambridge University Press. Autonomous Languages of Twins.
5. Three Decades of Twin Births in the United States, 1980–2009. National Center for Health Statistics. Three Decades of Twin Births in the United States, 1980–2009.
6. How to Have Twins with Different Fathers. 2023. McGill University. How to Have Twins with Different Fathers.