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The Biology of Prenatal Development DVD
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All ages referenced from date of fertilization, not last menstrual period.

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Baby's heartbeat counter: 53,988,493
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from doctor to baby

On August 02, 2008 (38 wks) the baby is due!  
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   — The heart beats 54 million times before birth.
   — Time to be born!
   — Air breathing begins.
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On June 21, 2008 the 9th month (32-36 wks) begins. 28 cm (11 inches)
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   — The fetus has a firm hand grasp. (8 months, 3 wks)
   — Amniotic fluid volume peaks. (8 months, 3 wks)
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On May 24, 2008 the 8th month (28-32 wks) begins. 25 cm (10 inches)
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   — Breathing motions are common, still without air in the womb. (7 months 2 wks)
   — The lungs produce "air pocket" cells from now until 8 years of age. (8 months)
   — Prenatal food affects newborn taste preferences. (8 months)
   — What the fetus hears now, he or she may prefer later (e.g. Mom's voice). (8 months)
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On April 26, 2008 the 7th month (24-28 wks) begins. 20 cm (8 inches)
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   — The eyes can detect low light and see in color. (6 months, 1 wk)
   — The ability to smell has arrived. (6 months, 2 wks)
   — The fetus can taste. (6 months, 2 wks)
   — Between now and birth, brain weight increases 400% to 500%. (6 months, 2 wks)
   — The eyes can produce tears. (6 months, 2 wks)
   — Body weight typically doubles from now until end of pregnancy. (7 months, 3 wks)
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On March 29, 2008 the 6th month (20-24 wks) begins. 18 cm (7 inches)
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   — If born prematurely from now on, survival is possible. (5 months, 1 wk)
   — Sudden, loud noises trigger a blink-startle response. (6 months)
   — The lungs produce a substance necessary for breathing after birth. (6 months)
   — Loud noise increases movement, heart rate, and swallowing. (6 months)
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On March 01, 2008 the 5th month (16-20 wks) begins. 14 cm (5.5 inches)
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   — Certain movements in the larynx are similar to that of speaking. (4 months, 2 wks)
   — A greasy white substance protects the skin from the amniotic fluid. (4 months, 2 wks)
   — Movement, breathing, and heart rate follow daily rhythms. (4 months, 3 wks)
   — Hearing begins, as does response to sound. (5 months)
   — All skin layers and structures are complete. (5 months)
   — The eyelids separate, and eyes open and close. (5 months)
   — Rapid eye movement occurs, just like adults when they dream. (5 months)
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On February 02, 2008 the 4th month (12-16 wks) begins. 8 cm (3.1 inches)
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   — Teeth are growing. (3 months, 1 wk)
   — Girls move their jaws more often than the boys do. (3 months, 2 wk)
   — A pregnant mom may feel kicking for the first time. (3 months, 1 wk)
   — If touched near the mouth, the face turns toward the side touched. (3 months, 2 wks)
   — Girl fetuses move their jaws more often than boys do. (3 months, 2 wks)
   — Body fat emerges throughout the body. (3 months, 3 wks)
   — The fetus produces stress hormones when poked with a needle. (4 months)
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On January 26, 2008 the 12th week begins. 6.5 cm (2.6 inches)
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   — Weight increased by 60% this past week. (12 wks)
   — There are taste buds all over the mouth. (12 wks/3 months)
   — Hands touch the mouth up to 50 times per hour. (3 months)
   — Many different hormones are present. (3 months)
   — Arms reach their final proportion to body size. (3 months)
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On January 19, 2008 the 11th week begins. 5 cm (2 inches)
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   — The face now makes complex expressions. (11 wks)
   — Now you can tell if it's a girl or boy! (11 wks)
   — Intestines absorb water and glucose from swallowed amniotic fluid. (11 wks)
   — The nose and lips are completely formed. (11 wks)
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On January 12, 2008 the 10th week begins. 4 cm (1.6 inches)
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   — Yawning begins. (9 wks, 4 days)
   — Vocal cords are developing. (9 wks, 4 days)
   — Body weight increased more than 75% just this week! (10 wks)
   — Bones are hardening throughout the body. (10 wks)
   — Fingernails and toenails begin to grow! (10 wks)
   — The right and left sides of the brain are connecting. (10 wks)
   — Tiny folds in the skin form unique fingerprints. (10 wks)
   — The eyes roll downward after stimulating the upper lid. (10 wks)
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On January 05, 2008 the 9th week begins.   2.5 cm (1 inch)
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   — The mouth opens and closes, and the tongue moves. (9 wks)
   — The eyelids are now fused. (9 wks)
   — Swallowing amniotic fluid is beginning. (9 wks)
   — The fetus sighs, stretches, and moves the head. (9 wks)
   — Female fetuses have early reproductive cells in their ovaries. (9 wks)
   — Thumb sucking begins. (9 wks)
   — Grasping objects begins. (9 wks)
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On December 29, 2007 the 8th week begins. 17 mm
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   — The hands touch each other, as do the feet! (7 wks, 4 days)
   — Knee joints have arrived. (7 wks, 4 days)
   — The fingers are free. (7 wks, 4 days)
   — The toes are free. (7 wks, 6 days)
   — Occasional breathing motions begin. (8 wks)
   — The skin thickens, losing transparency. (8 wks)
   — Some embryos are right-handed, some are left-handed. (8 wks)
   — Male embryos are already making testosterone! (8 wks)
   — The embryo floats and rolls over in the womb. (8 wks)
   — The embryo's joints are similar to adult joints. (8 wks)
   — The embryo has more than 4,000 parts (adults have about 4,500). (8 wks)
   — The embryonic period ends at 8 weeks, then the fetal period begins. (8 wks)
   — Hair grows on the brow and around the mouth. (8 wks)
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On December 22, 2007 the 7th week begins. 11 mm
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   — Brainwave activity is reported. (6 wks, 2 days)
   — Bones first form in the collar bones and jaw. (6 wks, 4 days)
   — The hands begin to move. (6 wks, 4 days)
   — The heart is nearly complete. (7 wks)
   — Testes are present. (7 wks)
   — Ovaries can be identified. (7 wks)
   — The head sometimes turns. (7 wks)
   — Fingers and toes emerge. (7 wks)
   — Hiccups may occur from now on. (7 wks)
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On December 15, 2007 the 6th week begins. 6 mm
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   — Joints of the wrists are forming. (5 wks, 1 day)
   — Foot plates are present. (5 wks, 2 days)
   — Subtle movement begins. (5 wks, 5 days)
   — The heart's four chambers are easily seen. (5 wks, 6 days)
   — The face withdraws if lightly touched around the mouth. (6 wks)
   — The diaghragm is largely formed. (6 wks)
   — Electrical connections are forming in the spine. (6 wks)
   — The external ear is taking shape. (6 wks)
   — The appendix can be seen. (6 wks)
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On December 08, 2007 the 5th week begins. 4 mm
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   — The brain's five main sections are visible. (4 wks, 4 days)
   — Cerebral hemispheres appear and begin to grow rapidly. (4 wks, 4 days)
   — The head makes up one third of the whole embryo! (5 wks)
   — The permanent kidneys are in place. (5 wks)
   — Hand plates have arrived. (5 wks)
   — Lung sections reflect the pattern of adult lungs. (5 wks)
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On December 01, 2007 the 4th week begins. 2 mm
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   — The heart begins beating! (3 wks, 1 day)
   — The amnion surrounds the embryo with a fluid-filled sac. (4 wks)
   — The umbilical cord is in place. (4 wks)
   — The heart beats more than 100 times per minute. (4 wks)
   — Limb buds (soon-to-be arms and legs) appear. (4 wks)
   — Part of the brain that will control coordination is present. (4 wks)
   — The skin is so thin, you can see through it! (4 wks)
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On November 24, 2007 the 3rd week begins. 0.5 mm
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   — The early heart can be seen. (18 days)
   — The brain has three major divisions. (3 wks)
   — Blood cells and blood vessels are forming. (3 wks)
   — The heart is shaped like a tube. (3 wks)
   — A tiny trachea or windpipe is forming. (3 wks)
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On November 17, 2007 the 2nd week begins. 0.2 mm
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   — The hormone hCG triggers a positive pregnancy test. (8 days)
   — Cells in the womb near the embryo are loaded with nutrients.
   — The amniotic sac begins forming. (10 days)
   — Implantation is complete and the placenta is starting to form. (12 days)
   — The embryo is now symmetrical about the midline. (13 days)
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On November 10, 2007 the first week begins. Size:  0.1 mm
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   — Development begins with a single-cell embryo at conception!!! (Age: 0 days)
   — One cell becomes two. (30 to 36 hours)
   — With 12 to 16 cells, the embryo is shaped like a tiny bunch of grapes. (3 days)
   — The site of the future back and chest can be seen. (4 days)
   — The embryo begins to implant in the womb. (6 days)
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