The cold and flu are viral infections, so antibiotics won’t work.
You should make sure your child is drinking plenty of fluids, as fever can cause dehydration, in addition to rest.
If you need to clear your child’s stuffed nose, introduce a humidifier or use a decongestant oil like Olbas, dabbed on their pillow or clothing.
You may want to administer a painkiller suitable for children such as Calpol or Nurofen, but make sure to speak to a doctor or pharmacist first to ensure it will be safe and effective for your child’s cold.