I’m a big fan of the hylands cold medicines
I swear by a cut onion on the bedside/in the room. Whenever my little girl is congested we do this and she wakes up much clearer. Also steam in a bathroom from the shower!
We have a large salt lamp acting as a normal lamp, and when he’s congested we leave a humidifier w Baby Euky bear solution in it, releases eucalyptus and a bit of lavender. Colostrum, breastmilk can help so if BF keep BF and offer more through bottle if they have trouble sucking on boob.
Homeopathic Cold Calm from Biron works wonders- available on Amazon give it a try
Humidifier at night? Also craniosacral therapy helped us too to get fluids moving in the sinuses.