As all of us know, turmeric has lots of medicinal uses. I could see that turmeric powder is a best medicine for cough in kids. Add a pinch of turmeric powder (it should be pure & better if we can use home made powder) to warm milk (sugar can be added) and drink twice a day for 2-3 days. It's very effective.
Note: I got this tip from my father in law when my son caught cough in his younger age. I have never given him any cough syrups yet. So I usually suggest this tip to all my friends and sharing it here too.