The 4-8 week old fetus should be developing brain growth. The hand plates, and cartilage should begin to grow. There is a 75% chance that the fetus is going to be right handed at this point in time. Also at this point there are at least 1 billion cells in the fetus body which is only at about the size of a Lima been. 90% of the structures of an adult are in the fetus at this point.
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