K.C.
If it is truly a UTI she will needs antibiotics. It is a bacteria infection and you can not get rid of bacteia with cranberry juice unfortunatlly. There are no outwards signs of a UTI besides the very high fever, so if you are suspecting it maybe its a yeast infection (common in babies with diapers especially girls.) My almost 1 year old daughter just spent a week in the hospital because of a UTI, so I am fairly sure they do not take them likely. I waited the fever out for a few days to see if it was viral (4 days) then ended up taking her into the er with a seizure so don't wait. At the time in the hospital we saw 6 other children come in and stay the week with a UTI, so I think it may be better treated with IV antibiotics. We just got out Saturday, so it must be going around!!!