While the holiday was first a pagan one centered around the Winter solstice, Christians adopted that time of the year to celebrate the birth of Jesus Christ, after whom the religion and this celebration are named, of course.
If there is one time of the year that kids are most excited about it is definitely that of the winter holidays, and this is true no matter what part of the world you are in, a cold or hot one, as Christmas is quite universal, and a special day enjoyed heavily by all the members of a family, no matter their age!