Babypowder these days is cornstarch, which is pure sugar. Yeast (and other fungus) feed off of sugar... so if you suspect fungus avoid baby powder like the plague.
Medicated foot powder is still talc mixed with antifungals. If you need a powder for her feet, stick with one of those.
ALSO, if you look closely, most things say "2 and up except under care of a doctor". Which while just legal pass the buck, is also a good idea in general.
Good move on the doctors appointment. Many yeast infections have the blisters that you're talking about (a yeast infection can happen anywhere there is moisture, warmth, and a food source)... but they'll know in 2 seconds just by looking.
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((And so I don't get any snarky PMs... there are 3 basic food type substances:
- Fats (lipids)
- Proteins (amino acids)
- Carbohydrates (sugars)
There are many kinds of sugar; fructose, lactose, glucose, galactose, sucrose, etc. Anything that ends with an "ose" ending denotes a sugar.
Corn Starch is a carbohydrate (which means it's a sugar), and actually is a polysaccharide (meaning it is made of more than one kind of sugar). The primary sugars that make up cornstarch are glucose and amylose. So no... one will not find the word "sugar" on the ingredients list... because "starch" MEANS "a type of sugar". The same way that sodium means a type of salt. Not all sodium things are table salt, however. Same principle.