If your baby is exhibiting symptoms such as ear infection, cough, runny nose, and yellowish eye discharge, it is important to practice good hygiene to help alleviate these symptoms. Following the guidelines provided in the document linked by the user, which includes nasal hygiene techniques, can help improve these symptoms within a couple of days. However, if your baby develops a fever, it is best to consult a doctor, especially if the fever persists for more than two days.