You can put catnip out any time you want with kittens as it won't hurt them. However, all the stuff I've read about it when I researched it when I was fostering kittens said that most kittens either can't smell it or don't respond to it until they are older. That's what happened with mine. They ignored it and somewhere around 5 months they started to notice it or smell it or respond to it.
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