What do you give your babes for allergies ? My son is so congested in his nose and chest . Nothing…

What do you give your babes for allergies ? My son is so congested in his nose and chest . Nothing is fully helping . And his eyes are starting to get puffy and itchy. Noticed today my allergies started acting up to so I assume that’s what it is with him. He had them last year but a doctor diagnosed it so it was easier lol