It's cold this time of year, so never leave your new puppy outside. Make sure they have tons of food and water at their disposal so they don't go hungry or thirsty.
Plenty of love and attention is required to help your puppy fit in and thrive in their new home. Once the new wears off (which it will), don't forget that your new Christmas puppy is a part of your family and requires lots of love and play time.
Potty breaks at 2 hour intervals with lots of praise will help your puppy be housebroken within a week or so, depending on the age and breed. Never discipline your new puppy for having an accident in the home, they will learn to go outside with lots of patience.
Finally, if you can't care for your new puppy or you just don't have the time once the new wears off and the kids are back to school, don't feel guilty for wanting to find the perfect home for your new puppy. There are lots of dog lovers out there who would love to give your Christmas pet the home they deserve. Just don't get a new puppy next year for Christmas if it didn't work out this season.