Fetal development

Fetal development during the first trimester:
The most dramatic changes and development occur during the first trimester. During the first eight weeks, a fetus is called an embryo.
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As fetal development progresses through the pregnancy, problems may arise in the development of internal and/or external sexual organs.
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During fetal development, the esophagus and the trachea arise from the same original tissue.
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During fetal development, the outer ear or "pinna" forms at a time when many other critical organs are developing (such as the kidneys).
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During male fetal development, the testicles (testes) form in the abdomen. In the final months before birth, they typically move down into the scrotum. But sometimes one testicle fails to fully descend.
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A congenital arteriovenous fistula is one that formed during fetal development. It is a birth defect. In congenital fistulas, blood vessels of the lower extremity are more frequently involved than other areas of the body.
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During fetal development, the foot passes through a number of stages in which it is flexed and turned outward until it assumes its normal position, which should happen by the seventh month.
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Congenital heart defects form during fetal development and may result in abnormal blood flow through the heart after a baby is born.
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CAUSES"Also called trisomy 21, Down syndrome occurs during fetal development, but is not inherited. The problem is an extra 21st chromosome. It occurs in 1 out of 700 live births.
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Joints and bones usually grow normally during fetal development. However, in a small percentage of newborns, the pelvis has not formed its usual deep socket. Therefore, the head of the thighbone can slip partially or completely out of the socket.
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Malformation: A structural defect in the body due to abnormal embryonic or fetal development. There are many types of malformations. For example, cleft lip and cleft palate. See also Congenital malformation.
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Other children may experience abnormal fetal development that affects the areas of the brain controlling attention and movement.
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Genetic Diseases, Inborn - Diseases that are caused by genetic mutations present during embryo or fetal development, although they may be observed later in life. The mutations may be inherited from a parent's genome or they may be acquired in utero.
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A fibrous cord that connects the urinary bladder to the umbilicus (navel). The urachus is formed as the allantoic stalk during fetal development and lasts through life. Also called the median umbilical ligament.
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A spontaneous abortion is the loss of a fetus during pregnancy due to natural causes. The term "miscarriage" is the spontaneous termination of a pregnancy before fetal development has reached 20 weeks.
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Immunoglobulin D (IgD)
Immunoglobulin receptor found on the surface of B-cells . May function during fetal development of the immune system.
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