Refer to the passage below and then answer the question afterwards in the same language as the passage:

Passage: In young children, the only symptom of a urinary tract infection (UTI) may be a fever.  Because of the lack of more obvious symptoms, when females under the age of two or uncircumcised males less than a year exhibit a fever, a culture of the urine is recommended by many medical associations. Infants may feed poorly, vomit, sleep more, or show signs of jaundice. In older children, new onset urinary incontinence (loss of bladder control) may occur.

Question: What might be the only symptom of UTI in children?
fever