Hi...It could be a simple viral pharyngitis to streptococcal infection. I suggest you get the streptococcal rapid antigen testing done...the results will be available in 10 minutes. If it is negative you can wait. Otherwise he needs antibiotic therapy. Cough and cold are viral 95% of the times in children. For cold you can use anti-allergics like cetirizine and for nose block, saline nasal decongestants will do. Paracetamol can be given in the dose of 15mg/kg/dose every 4-6th hourly, that too only if fever is more than 100F. I suggest not using combination medicines for fever, especially with Paracetamol. For cold you can use Cetrizine at 0.25mg/kg/dose every 12 hourly for 3 days. For nasal block, plain saline nasal drops will do, every 4-6th hourly to relive nasal congestion. Regards - Dr. Sumanth