"Your baby now weighs around 6 pounds and is 20.7 inches long.
Your baby works hard to accumulate all the fat she can in preparation for delivery. Her body grows rounder every day, since about 15% of her total weight is now made up of fat. Once she’s born this fat layer will help her maintain her body temperature and give her a reliable energy source.
Developments this week:
Organs. Development of major organs, such as the kidneys and liver, is complete.
Lungs. Some fine-tuning, such as the final development of the lungs, still takes place inside the womb.
Head. Your baby's head is round, but by the time she makes it through the birth canal it may be temporarily misshapen as powerful contractions compress the soft bones of the skull. Her head shape will return to normal within a few days."