Safest is to try saline nasal drops if you know how to administer it.

https://www.babychakra.com/learn/2234-6-pediatrician-approved-natural-remedies-for-cough-cold-in-kids

For cold pls do visit a dr. You can start steaming

<font color ="#3b5998"><b><a href="http://app.babychakra.com/article/929">Why You Must Opt For Steam For You And Your Child?</a></b></font>..