What are some common signs of childhood illness in two to four month old babies?

Infant illness. This can be varied but generally, fever, cough, rhinorrhea, poor appetite, strong smelling urine, fussiness, lethargy, decrease activity. .
Irritability. The ill infant may develop excessive crying, irritability, refuse feedings, or change sleep habits. The obvious diarrhea, cough, or rash may be easy for you to handle at home or with a call to the nurse.