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Identical Twins Personalities Switch

Which is which?
We’ve got identical girls and often rely on their mannerisms and personalities to tell them apart.

If you rely on this too, or hope to, be careful: twins switch personality traits at will.

For example, one of our girls will be shy one week while the other is a social butterfly. Just when you think that is the pattern, they switch and the social standout now cries hysterically with strangers. Go figure.

We’ve seen switching of twin personalities and traits even at an early age in all these cases:

  • who is a good eater
  • who is a wiggle worm
  • who wakes up first
  • who takes good naps
  • who drinks her bottle in one sitting
  • who smiles at strangers
  • who makes what sounds (our girls aren’t talking yet)
  • who steals toys from the other

So if you want to keep your twins straight, particularly if they are identical, combine multiple data points in identifying each. Combine personality traits and even subtle visual clues to properly identify who is who.

It is fascinating to watch the switcheroo happen. Just keep your eyes open and enjoy the journey.

Further Reading

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Written by , author of The Dad's Guide to Twins


  1. Danielle Hernandez says

    I’m noticiing this more and more as my identical twins get older. It’s getting more and more distinctive, and lasts from 2-3 weeks everytime…. then they just snap back.

    • says

      @Danielle – thanks for sharing the experience with your twins. Each of our girls has some core personality traits that remain constant but they definitely still switch other characteristics back and forth.

  2. Penny says

    This is SOO true!!! We are experiencing it as we speak! For the umpteenth time, our identical twin girls are acting opposite each other and it is crazy!

    I dread it because it messes with my head when they do and it seems so intense when it’s opposite actions!

  3. Debby says

    oh Wow! My identical twin grandsons switch personalities regularly. One will brood while his brother socializes, then the other will get his brooding time in while his brother is socializing. We just go with the flow. If I am around them I can tell them apart. I have no clue how I do it, there is obviously something that I’m subconsciously aware of with each of them. However, now that they are older and don’t require as much of grandma’s gushing over them and preferring High School activities instead, I am embarrassed when I ask them “what is your name,” and they smirk and tell me their name. Once they tell me their name my “subconscious twin indentifying mechanism” kicks in, and I know who is who. It’s always so much fun! 🙂

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