For an older baby who is eating some solid foods, try frozen fruit bars as a way of encouraging her to get extra liquids. Soup or broth may ease her congestion as well. For muscle aches and fever, give your baby a pain reliever such as children's acetaminophen or ibuprofen. While it's always a good idea to call your doctor about any illness in a young baby, don't pressure your pediatrician for medication. You may have heard of antiviral drugs that can help halt the flu's progression, but they haven't been approved for children less than a year old.
Antibiotics are also off limits.
A virus, not bacteria, causes the flu, so antibiotics won't work. In some cases, however, if your baby develops a secondary bacterial infection, such as pneumonia, an ear infection, or bronchitis, antibiotics are in order. But this is just an average. The good news is, if she has the flu now, she probably won't get it again this year because she's developed immunity to the particular strain currently roaming around. But next year is another story.