The Fetal Stage
Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as a fetus. The early body systems and structures established in the embryonic stage continue to develop. The neural tube develops into the brain and spinal cord and neurons form. Sex organs begin to appear during the third month of gestation. The fetus continues to grow in both weight and length, although the majority of the physical growth occurs in the later stages of pregnancy.
Problems During Prenatal Development
Most prenatal develop occurs normally, following the established patterns with little variation. However, there are a number of things that can go wrong during this time, which are usually caused by genetics or environmental problems.
Genetic Problems
Down Syndrome Also known as trisomy 21, Down syndrome is the most common genetic anomaly during prenatal development. Down syndrome is caused by and extra copy of the 21 chromosome (meaning there......
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