in young children, fever can be the only symptom of a urinary tract infection (uti). many medical associations recommend a urine culture for females younger than two year old or uncircumcised males who are younger than a year and have a fever. infants with uti sometimes eat poorly, vomit, sleep more, or show signs of jaundice ( a yellow coloring of the skin). older children can have new urinary incontinence (loss of bladder control).