It would probably be best to separate the two kittens and introduce them gradually. Another way to help them get used to each other is the old towel trick - rub one then the other with a towel to exchange scents.

You might try having an interactive play session using a cat wand toy and let them both have a chance to chase it.

To lessen the first kitten's anxiety, try getting a Comfort Zone plug-in with Feliway.
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Smile, it will make them wonder what you are up to!

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