What can I give her?

She will be 4 months on the 31st. She has a cough & congestion I’ve been giving her tylonal but it’s not helping when should I have her seen she’s just so small and when she cough it rely bothers her 🤕🤒 when should I take her to he seen for this? She dose not have a fever but is warmer then usual. Tia! Pic of my cutie pie. 🥰