At the beginning of this stage, all the organs are formed in a rudimentary fashion. During the second trimester the body grows more rapidly than at any other time in life. Towards the end of the second trimester, the brain wave patterns begin to look similar to those of a newborn. The cerebral cortex grows rapidly, folding to take on the characteristic wrinkled appearance of brain tissue. About 277 days after conception, on average, labor begins and a new baby enters the world.
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