How soon you can go outside for a fresh air with a new born baby, how soon after his birth?

Now is OK: The potential problems with taking your young infant out during the first few months are not related so much to being outdoors as to the contact with others who might harbor a contagious infection. It is usually safe to take your newborn outside as long as he or she is appropriately dressed for the weather and extremes of temperature are avoided. Avoid crowds and sick people.