What is the difference between talc baby powder and cornstarch baby powder? I had another mommy freak out at me when I went to Wal-Mart today and she was telling me how I was a horrible mommy for using talc baby powder. I dropped my items in the middle of the isle and walked away. I mean I know that some people can get very opinionated when it comes to force feeding info to pregnant mommies and such but the way she acted it was just to much for me to handle. So who is using cornstarch baby powder and who is using talc baby powder? And why?