At how many weeks is it safe for a newborn to come outside?

Caution for 2mo: Babies are gifted with much of mom's immunity @ birth which provides some protection.They are also exposed to germs @ birth that may wait to cause problems for weeks, some of which cause serious illness. If baby develops a fever in the first 6-8 wks, they are often hospitalized for tests & rx.Keeping them away from sick people can help u avoid a hospital stay.Going out is fine in healthy settings.

38 weeks: 37 to 38 weeks since lungs are mature by tehn .Preferably full term between 39-41 weeks is the ideal time.