A.D.
Hi,
My daughter is also 5 and we had the same "itch" problem with her. I found that if her panties were too snug they would irritate her skin (she's on the lean side, and wears a size 8 panty right now).
We can't use ANY type of baby wash in her bath; her pedi. recommended using only 1 cup of white vinegar.
We use the Cottonelle wipes whenever she uses the bathroom. Plain toilet paper also irritates her.
Hope this helps! A.