Hello...I understand your concern.
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. But this is a prescription medication. Instead you can use Syr Benadryl 5ml three times a day or on as and when required basis. Although this is a first generation antihistamine medication - this is an excellent cough suppressant too.
For nasal block, plain saline nasal drops will do, every 4-6th hourly to relive nasal congestion.
Unless there is respiratory distress or feeding difficulty or high grade fever of more than 102 to 103 F - there is nothing to worry and you can wait for it to get better by itself please.
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