Yes, vomiting in a 2-year-old could potentially be linked to taking Singulair. It is known that around 2% of children may experience nausea and a decrease in appetite while taking this medication. This side effect typically lasts for about 2 weeks before subsiding. It is advisable to continue giving the medication to see if the symptoms improve. If there is no change after 10 days, it would be a good idea to contact a pharmacist to explore if there might be an alternative medication that could be better tolerated.
