It is called "Nativity" and is by Brian Kerkisnick, here is a bigger picture. I saw it once at the BYU Museum of Art and it is stunning in real life, 17 feet long X 7 feet high. I can't even begin to say how much I LOVE this painting. It is my favorite depiction of the Nativity because it seems the most realistic-- Mary breastfeeding Jesus (yes, she would have), Mary attended by two midwives (yes, she would have been), the angels pressing down to see-- young and old, the dog with her puppies in the stable, and Joseph overwhelmed and awed. Someday (when we are rich) I'd love to have a HUGE copy of this painting to hang in my house. I love it.
Here is a picture that shows you just how big it really is. If you are ever at BYU, there is a much smaller copy of it on the 4th floor of the Joseph Fielding Smith Building (JFSB) by the English Department offices.