At week 12, the babies are approximately 2.5 - 3.5 inches and weigh about 12 - 14 grams each. By now, nearly all of the baby's organs, structures and systems are fully formed. After week 12 the babies will enter the maintenance stage for (hopefully) the next 28 weeks where they will work to mature and gain weight. The heart begins pumping several quarts of blood through the baby's body every day. The babies have also begun to develop nerves and a spinal cord, allowing them to feel some types of pain. While the baby's brain is not the same size it will be at birth, it does have the same structure. Fingers and toes have separated and hair and nails continue to grow. Also, the external genitals can now show definite signs of male and female gender.
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