...PLUM! The most dramatic development this week: reflexes. The twins fingers will soon begin to open and close, thier toes will curl, thier eye muscles will clench, and thier mouth will make sucking movements. In fact, if you prod your abdomen, the babies will squirm in response, although you won't be able to feel it. Their intestines, which have grown so fast that they protrude into the umbilical cord, will start to move into their abdominal cavity about now, and thier kidneys will begin excreting urine into thier bladder.Meanwhile, nerve cells are multiplying rapidly, and in the babies brain, synapses are forming furiously. Their face looks unquestionably human: their eyes have moved from the sides to the front of thier head, and thier ears are right where they should be. From crown to rump, the babies are just over 2 inches long and weighs half an ounce.
Here is a diagram of what the twins look like in the womb at 12 weeks...
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