Thanks for your query.
I understand your concern.
Relax,there is nothing to worry.
is mostly viral in nature and takes few days to settle.
I suggest you to give plenty of fluids,warm liquids will be helpful.
Give steam inhalation.
Give mixture of XXXXXXX leaves in warm water with few drops of honey,ginger and lemon.
Watch for any fever
You can give benadryl
2ml 3 times a day.
In case symptoms persist get them examined by pediatrician
Hope I have answered your query.
Let me know if I can help further.
Wishing your kids good health.