Hello, andto BP.net...
Are you sure it only hatched a few days ago? If that is true hopefully some of the breeders on here will help you out with caring for a hatchling. Most breeders won't let hatchlings go until they have their first shed and get them eating a few meals. You might want to consider getting a 10-15 quart tub and putting the hides and water bowl in that to keep the snake in. You can set the tub in the tank 1/2 over the heater for a warm side, or use the heat mat on the tub itself until the snake is a few months old and eating consistently for you.
For your question concerning hides, they move back and forth to thermoregulate whenever they need to. Alot of times when snakes are put into a new enclosure they will tend to stay in one hide or the other for a day or so until they feel secure and comfortable enough to move between them...