The sources for what is written in the Holy Gospels would have been immediate to the historic circumstances, with Mary and Joseph being primary witnesses, but many others, too. These things were done publicly in view of many people. Because the Sacred Scriptures are breathed by the Holy Spirit, they testify predominantly of Christ Himself, rather than of themselves, those who witnessed these things, and how the accounts were specifically drawn.
Even one who writes an article for a newspaper does not render a great deal about the process for future readers to explore, because it is not particularly germane except for the sake of curiosity. But the Sacred Scriptures do testify clearly as to their purpose, namely to raise up the Crucified One as our Righteousness for all generations before and since His participation in this vale of death on our behalf.
Had these things taken place in this day and age, they would be subject to cheap rumor mongering, media sensation, and worse distortion than already takes place on account our flesh and the evil one. There is a reason the Holy Spirit testifies that Christ came into the flesh “in the fullness of time.” There is no happenstance about it, as we will see together most clearly at The Last Day.
Now we will commence looking at the Infancy Narrative according to Luke 1. Luke 2 will follow in six days or so.