Just keep in mind that tylenol has acetaminophen in it. Too much of it can cause liver failure and permanent liver damage. Be sure you are giving her childrens tylenol and not adult tylenol. However, children's tylenol is for children 2 yrs and older. With an infant less than a year old you should not give her tylenol at all without the direction of a doctor. If you want to bring her temperature down naturaly give her plenty of fluids such as her formula or plain water. If you have been giving her adult tylenol I would take her to a physician as in now and not later.