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How to introduce your kitten to the outdoors safely
Wait until your kitten is enthusiastic and curious about the outdoors.
Don't force them to go outside if they're not ready. Slowly ease into it.
Once you see that your kitten is ready for the outdoors keep the back door open a smidge and let him wander over to it. Once he gets outside he'll probably already be sniffing and adjusting to the new location and smells.