I Have 5 Months Old Boy His Wait 7.5 Kg

i have 5 months old boy his wait 7.5 kg i used maxtra drops 0.8 ml for cold nd immediately kufril-LS drops 0.8ml for cough after half an hour when am feeding he is in sleep nd my boy shaked his whole body for 30 sec it is same like adults shiwer when we go through saline bt am sure its not fits bcz no fever wt hpn to him i need to go any test plz give rply