Girls, I have a question. My older daughter has been stuffy and had…

Girls, I have a question. My older daughter has been stuffy and had phlegm. Now I see my little one also has phlegm. I give her Nyzivin syrup for kids. Then I clean her nose with an aspirator. But it's already day five, and there's no improvement yet. There are still phlegm sometimes. And another question, do you bathe your babies when they have phlegm? There are no other symptoms. I just think it can get worse?