Grandmama tip!
For diaper rash brown cornstarch in a dry frying pan on medium heat and constanly stir with a WOODEN spoon. (plastic ones melt. I know this from experience.) When the cornstarch is a light brown color take the pan off of the burner. Let cool completely. Put powder into a shaker and keep by the baby changing station. When you change the baby's diaper sprinkle on some corn starch.
My daughter had really bad rashes at first and this was the only thing that ever helped her and clear her up.