Breastfed bubs still get sick, often with less severity tho due to the antibodies in your milk.

I've heard you can use breastmilk up their nose as well to help flush it out if you can't put your hands on saline. You could also burn some oils in the room, or rub vicks baby balsam on the bottom of his feet. That might help clear it up enough for him to feed a bit better.

It's hard isn't it when they don't know how to blow their nose and clear it! They don't even know to sniff! Hope he feels better soon. It's hard to eat & sleep with a cold