4 1/2 inches long (head to rump) and 3 1/2 ounces. Legs are much more developed, the head is more erect than it has been, and the eyes have moved closer to the front of the head. Ears are close to their final position, too. The patterning of the scalp has begun, though the locks aren't recognizable yet. Started growing toenails. And there's a lot happening inside as well. For example, the heart is now pumping about 25 quarts of blood each day, and this amount will continue to increase as your baby continues to develop.