Hi,As you are saying your child has cough, cold and sneezing ,most common cause is common cold,I do not recommend you to give omnacortil which is steroid for this. Try the following advise 1Give him plenty of fluids. 2.Steam inhalation (very carefully). 3.Antiallergic and decongestants drops can be given for cold and cough. 4.Paracetamol ca be given for fever. Consult with good pediatrican in you area if child will have any of these danger signs 1.Breathlessnes: increase respiration,difficulty in breathing 2.High grade fever 3.Decrease oral intake 4.Repeated vomiting 5.Letargic/dull/decrease activity Omnacortil usually causes vomiting if given empty stomach, it also causes gastritis. Child still not started to sit on his own,needs complete milestone evaluation by pediatrician.Child usually starts to sit between 6-8 months of age. Wishing good health for your baby.