I would have used this a lot as a kid but I tend to slip into it now when I momentarily regress into a child-like state. It happens more often that you might think. Unless you think it happens nearly every day, in which case you would be right. Enjoy!
Just talk slower and add a little drawl. Lower your voice like you used to when you talked to your Golden Retriever. That's what I tell myself to get this voice just right. Enjoy!