Cold remedies for 6 week old?

Jesse • 5-15-13 👦🏻 10-20-16 👶🏼 July 2017 👼🏻👼🏻 7-8-19🌈 👶🏼 boy mama 💙💙💙

So my 2 year old got the baby sick. Totally all congested and full of mucus. You can hear it when he breathes and eats. I’ve been using the bulb to suction his nose, but honestly for the sound of his congestion and the amount coming out (barely getting anything) it doesn’t add up. He’s still nursing well and sleeping decent (he barely napped yesterday due to discomfort and slept alright tonight), but I want to know what can I do to help him along and make him comfortable so it doesn’t effect his sleep at night. He’s been way more fussy from being congested.