## **Pregnancy Timeline: The Amazing Journey of Embryonic Development** ### **The Initial Month: A Crucial Phase for Embryogenesis** During the first month, the fertilized egg undergoes rapid cell division, establishing the foundation for the developing embryo. By the end of the fourth week, the embryo forms three distinct layers: the ectoderm, mesoderm, and endoderm. These layers will give rise to all the vital organs and tissues of the body. ### **Weeks 5-8: Shaping the Body** In the fifth week, the neural tube develops, forming the brain and spinal cord. The heart begins to beat, and facial features start to take shape. By the eighth week, the embryo is fully formed with its major organs in place, resembling a tiny human being. ### **Weeks 9-12: Rapid Growth and Development** During the second trimester, the embryo undergoes significant growth and development. By the ninth week, the sex of the baby can be determined. In the following weeks, the limbs lengthen, the eyes develop, and the fingers and toes become more defined. ### **Weeks 13-27: Refining Details and Maturation** The third trimester is characterized by further refinement and maturation of the fetus. The eyes open, and the fetus starts to move and respond to external stimuli. Bones continue to develop, and the respiratory and digestive systems become more efficient. ### **Weeks 28-40: Preparation for Birth** In the final stretch of pregnancy, the fetus gains considerable weight and size. The lungs mature, preparing the baby for life outside the womb. The fetus also develops a protective layer of vernix caseosa and hair. By week 40, the baby is ready for birth, completing the extraordinary journey of embryonic development.
A Las Cuántas Semanas Se Forma El Embrión
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