First Six Days (04:59)
In the first six days of pregnancy, the egg is fertilized and cells begin to multiple. Meet a Norfolk family of identical quadruplets.
Life Expectancy (03:21)
Food an expectant mother consumes in the first week of pregnancy can determine the life expectancy of a child. A study conducted in Gambia, found that babies conceived in the wet season have a longer life expectancy than babies conceived in the dry season.
Immune System (03:08)
Gambian babies conceived in the wet season are born with stronger immune systems. The difference in life expectancy is obvious in Gambia but is found throughout the world.
Genetic Disorders (04:45)
On the 15th day of pregnancy, cells transform into 350 different cells that make up the human body. Melanie Gaydos was born with ectodermal dysplasia, a genetic disorder developed during this time.
Ectodermal Dysplasia (04:48)
Gaydos explains living with a genetic disorder. Gaydos has a variation on the TP63 gene and is the first recorded person to have a variation on that gene.
Growth Genes (03:00)
Normal babies double in size every 14 days for six weeks. Genes inherited from the mother and father are supposed to regulate a babies size. Nell inherited two growth genes, making her a large baby and is still growing rapidly.
Tumor Development (03:42)
Nell must be measured regularly; her growth genes increase the likelihood of tumors. At 7 years old, her rapid growth has begun leveling out.
Organ Placement (04:01)
On the 19th day of pregnancy, cilia begin to spin clockwise to tell the organs where to go in the body. Meet Randy Foye, a NBA player with situs inversus; all of his organs are a mirror image of a normal body.
Situs Inversus (02:52)
Foye describes living with this congenital condition. Foye's organs are a complete mirror image, if even one of the organs did not flip it could have been fatal or caused heart problems.
Heart Defects (04:15)
On the 21st day of pregnancy, the disk of cells becomes a tube. In the center of this tube are the muscle cells that will form the heart. Hannah is pregnant with a baby who has a heart condition.
Repairing the Defect (03:37)
Hannah went into premature labor and five days later her baby had to have heart surgery. The baby was small because of the early birth, but doctors were able to remove the blockage from the ventricle.
Finger Development (03:51)
On the 38th day of pregnancy, paddles at the end of limbs begin to form fingers. Meet the Da Silva family, where 14 members were born with six fingers on each hand.
Sonic Hedgehog (02:04)
The Sonic Hedgehog protein is the protein that makes us grow fingers. The Da Silva family has more of the protein, resulting in six fingers on each hand.
Eighth Week (04:43)
In the eighth week of pregnancy the cluster of cells become a fetus, with the inner ear and hip structure is completed. See a preview of the next episode of "9 Months That Made You."
Credits: The First 8 Weeks: 9 Months That Made You (00:43)
Credits: The First 8 Weeks: 9 Months That Made You
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