When is it ok to take a newborn out to visit relatives, I know they're more likely to get sick then us.

Hard to say. To me the scariest issue in the 1st 2mo is an infant with fever. Thats because some of mothers germs can quietly transfer to baby at birth ; weeks later become a major infection. It is good not to expose your newborn to a lot of people in the first 6-8 wks when a fever might be a terrible germ or uncle freds cold. If around, they must practice good hand washing ; staw away if ill.