I have begun to use cornstarch in my effort to stop using talc.
Here is an article about the dangers of talc. I investigated some recipes for natural baby pwder and here is one I found:
one half cup tapioca starch
one half cup arrowroot powder
one cup cornstarch
one tablespoon ground lavendar
You can also add the essential oil of your choice, by soaking a cotton ball with the oil and then leaving the cotton ball in the powder for 24 hours. It doesn't cause clumping. The mixture of the different powders creates a smooth powder, and you can make adjustments to your liking. If you want more of a dusting powder, you add a small amount of baking soda.
I know these ingredients seem strange and just for cooking, but they are free of chemicals and the things you eat are the things safe to enter your skin pores as well.