I got it when Hayden was 14mo, omg it was terrible..I didn't catch it until it was really bad...it was way worse that mastitis. But I was given a prescription which we tried for days and it did NOTHING!!!! So my pedi recommended Gentian Violet, it's an all natural thing, you get it from health food stores, places like that. If your pharmacy doesn't have it they should be able to order it, I did that at like 4pm one night and it was there the next day. But it's this dark purple stuff that you put all over your nipple and inside her mouth, it does stain and she will be looking like she just had the grapest lollipop ever for a couple days but it wears off lol but it works better than anything else, and fast too, within 24hrs I noticed a diff, I used it for 3-4 days though. Make sure you boil all pacifiers, bottles, anything else she puts in her mouth so she doesn't re-infect herself