Newborns (In most cases) get really snotty and congested for awhile they're just adjusting, my daughters went away In a few days

I wouldn't necessarily say it's a cold. Babies take time to adjust to room air. The more you suck out their nose you can make it swollen and also reintroduce bacteria into the nose. Wipe nose with a receiving blanket. Bathe or turn on shower to put moisture in the air and run a humidifier in babies room while sleeping g

Breastfeeding helps a ton and saline spray otherwise not much you can do.