The promo and the word "Miracle" in the title hinted at something a little more dramatic. The opening shot of the promo of the baby in a hospital ward hinted that there may be some medical issue that would come up requiring a literal miracle. Instead this was a formulaic movie of a person in a strange town stranded because of a combination of a snowstorm and car problems as Christmas approaches.
The gimmick here is that it's the city of Bethlehem, Northampton county, Pennsylvania (which is not far from where I used to have a vacation home decades ago, and not quite the small town with one hotel as the film implies). The stranded stranger is a divorced woman named Mary Ann who has adopted a newborn girl in Bethlehem whom she named Natalie and is about to drive home when the storm hits and closes all the roads. The one Inn in town has just reached maximum occupancy, and in this desperate situation for a mother with a newborn, the Innkeeper suggests that her brother, predictably named Joe and a mechanic and tow truck driver, put Mary Ann and Natalie in the guestroom at his home.
After that point, it's the same Hallmark Christmas movie we've seen many times. Mary Ann bonds with Joe and his family as they follow their family holiday traditions in the storm. Predictable ending. An average Hallmark movie for this particular plot, nothing that stands out.