I don't have the disc, but it appears this was originally released by DHM in 1990 under the title Baroque Christmas Music - Natus est Jesus
(see: http://www.ciao.se/Baroque_Christmas_Music__359597 ),
then rereleased by RCA in 1995 as Baroque Yuletide.
Try these links also:
http://www.music-disc.com/christmaslpcdcass.htm (search for baroque christmas music)
It also appears that ZWV 108 is the only Zelenka work on these discs. It has really become one of his best recorded vocal works.