A four-week-old kitten is a small, fluffy bundle of energy, about the size of a teacup or grapefruit and weighing roughly one to two pounds.
Its fur is soft and growing in, its eyes are open and focusing, and its ears are becoming more pointed. It has baby teeth and is more active than a newborn, crawling, tumbling, and beginning to play. Four-week-old kittens are curious, playful, and increasingly social with littermates and humans.
Every kitten is unique, so sizes and activity levels may vary. Consult a veterinarian if you have health concerns.