Sick baby help

Cortney
My lil man 7 weeks today and I'm pretty sure he's got a head chest cold because it's been in my house for 2 weeks now going threw my whole family. He's not got a temp I've checked but he's coughing not a lot just a few times every few hours but I can tell by the way he's acting he's not feeling great. Any ideas on how I can help him?