Laryngomalacia has NO relation to cold and cough. Most infections in children are viral in origin and take 3-7 days to subside completely. If mild,avoid unnecessary medicine and just give steam inhalations for cold and cough and decongestant nasal drops for nasal block or increased cough on lying down. Use paracetamol for fever and repeat every 4 hours if required. If not improving in 3 days OR accompanied by other symptoms like wheezing or breathlessness or dullness and refusal to feed,consult your paediatrician or me here.