A fertilized egg splits into two embryos, creating identical twins, or monozygotic twins. The twins are genetic duplicates because they split early in the pregnancy. Fraternal twins, or dizygotic twins, are born when two eggs are fertilized by different and share 50% of their genes like other siblings. Twinhood begins with a shared experience from conception to birth. Growing up together, twins often develop a language only they can understand.

The phenomenon of “cryptophasia” or “twin language,” where twins create their own language of gestures, sounds, and expressions to communicate before they learn to speak, has been studied. As twins grow up, their bond grows. Twin telepathy—a strong sense of empathy and understanding for each other’s emotions—is common.

They instinctively understand and respond to each other’s feelings, providing support and comfort during difficult times. Twins develop their own language, expressions, and inside jokes as they grow, strengthening their bond. They celebrate each other’s successes and support each other through tough times. Twins are inseparable, so their friendship is unmatched. The twin bond includes “twinship identity.” Twins’ self-perception often centers on their twinhood.

This identity may change their choices, friendships, and worldview. Accepting their twinship identity helps them appreciate their uniqueness and cherish the bond that makes them part of a rare and special community. Despite their closeness, twins have distinct personalities, interests, and dreams. Despite their unique connection, they value their individuality.

This delicate balance between twin bond and individuality is crucial to their growth and self-discovery. The twin bond is difficult. The closeness can cause conflicts and competition, especially in childhood and adolescence. Twins often overcome these challenges and strengthen their bond through communication, understanding, and respect as they mature.