Does it burn? ACV and athlete's foot

My 16 month old has what appears to be athlete's foot between ALL of his toes. The pediatrician told me that children this young do not get athlete's foot - which I do not believe. I found this blog http://curezone.com/blogs/f.asp?f=179 which says that ACV can help. I really want to know if it is going to burn/sting. I would hate to put it on my baby's feet and have him screaming in pain. Do you think it would still be effective if I water it down (50/50 or more)? Thanks! Tweet