I have a natural Hayfever gel (Botanica brand) from NZ for my son. You put a little inside their nose to create a barrier and stop the pollen and dust getting in. It’s also soothing. There is nothing on the pack that says it wouldn’t be suitable for your son’s age but you could check on their website. It works really well. http://www.botanica.co.nz/product/hayfever-gel-2/
*I found it in an online p[pharmacy for a cheaper price than their website too.
Published 28th January 2020