I know it was not absolute silence. A few shepherds, a few wise men from a distant land and some close family witnessed the miracle. Also the new star even led to a mad search to hunt and kill the future King. However, this reason for the killings did not seem to have been published and basically the Jewish world at large, let alone the Gentile one, did not seem to notice that Messiah had come very much at all. In fact there is almost no historical record of anything remotely suggesting the occurrence outside of the gospel accounts. Considering the size of humanity this small fanfare seems more like a little ripple around a pebble slipped quietly into the Ocean.
The question then is 'Why did Messiah arrive in such silence on Christmas day?' Why not a more publicly proclaimed entry of the anointed King and only Son of God into the world? Does it make sense that Messiah would enter covertly and in such secret humility?