Anyone encounter infant 3 month plus going 4 month having flu cough and fever

My LO had phlegmy cough nearing 4 months. Brought to pd and given nasal drop to ease the phlegm. Also bought the mucus suction to get rid of mucus in the nose. My LO did not have fever only alil warmer body and i wipe LO with wet wipes since its cold/ room temperature water. PD say as long as LO eat and sleep well it is fine. But since urs have fever i think its better to go to doctor.

My girl is that age and has had runny nose since entering IFC at 2 mths old. the nose hadnt bothered her until it started getting worse yesterday, coughing and not wanting to drink. brought to dr, was told to monitor and bring to A&E if start having fever as the runny nose has been persistent for a while. also need to monitor that she continues to have wet/dirty diapers :(