It's some sort of newborn mammal, mewling weakly when you handle it. Its fur is soft and a pale white, and its eyes are shut against the light of the outside world; it's clearly helpless without a caretaker to watch over it.
The animal has put on some weight from your constant attention, and has finally opened its eyes. Its fur is darkening in some spots, particularly its face and paws, and its fur has grown more plush. The young animal can't quite be described as lazy, but nonetheless it doesn't seem particularly interested in spending energy and much prefers finding a cool, dry place to curl up and sleep. You might have trouble finding its hiding spots if you didn't hear the constant snuffling as it investigates its surroundings. You're also starting to realize that the little guy sheds. A lot.