It is generally recommended to wait a couple of days before consulting a doctor when a child has a fever. You can try giving them Tylenol or Advil to help reduce the fever, but it is also important to let their body's immune system work to fight off the illness. Keeping their nasal passages clean with saline solution can also help alleviate symptoms of a runny nose and cough. If the child exhibits concerning symptoms such as vomiting, dehydration, lethargy, or difficulty breathing, it is advisable to seek medical attention promptly.