My daughter is 6 weeks old i need some advice?

At 6 weeks old there is no medication you can give her. For congestion use saline drops and a nose sucker thing, a humidifier or run the shower very hot and get the bathroom steamy and take her in there for 10 mins. or so. As for constipation...my son grunts, groans and turns red but is not constipated. That's just how he poops. She is only constipated if her poo is hard and like pellets. Going every other day is normal for some babies.