A month after conception, a human being is one-sixth of an inch long. The tiny heart has already been beating for a week, and the arms, lets head and brain have already begun to take shape. At two months, the child would fit into a walnut shell; curled up, she measures a little more than an inch long. Inside your closed fist, she would be invisible, and you could crush her without meaning to; even without noticing. But if you open your hand, she is virtually complete, with hands, feet, head, internal organs, brain, everything in place. All she needs to do is grow. Look even more closely with a standard microscope, and youll be able to make out her fingerprints. Everything needed to establish her identity is already in place.
Servant of God, Dr Jerome Lejeune