If there is no fever
then you can do wait and watch.
give symptomatic management for vommiting and loose stool
, like give more of fluid with salt and sugar and maintain hydration.
For nasal blockage give syrup with oral decongestant and antihistaminic.
and wait for 1day if symptom improve continue same if not plan antibiotic according to the weight like azithromycin
in doubt do reply