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All ages referenced from date of fertilization, not last menstrual period.

Kirsten and Mark's Pregnancy Calendar

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Baby's heartbeat counter: 53,988,493

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from doctor to baby

On March 18, 2008 (38 wks) the baby is due!


—	Breathing motions occur about 70% of the time.
—	Baby's foot is now about three inches long (about 7.5 cm).
—	Baby sometimes drinks 450cc (or 15 oz) of amniotic fluid each day.
—	Thighs are about three inches long (about 7½ cm).
—	The heart beats 54 million times before birth.
—	Time to be born!
—	Air breathing begins.
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On February 05, 2008 the 9th month (32-36 wks) begins.

48 cm (19 inches)


—	Baby weighs about 2,500 grams (about 5½ pounds).
—	What the fetus hears during these last weeks of pregnancy, he or she may prefer later (e.g. Mom's voice).
—	Baby's feet are now 15 times their length at the age of 8 weeks.
—	Steady weight gain is a hallmark of the last weeks of pregnancy.
—	The fetus has a firm hand grasp.
—	Amniotic fluid volume peaks.
—	The number of heartbeats since conception is now greater than 50 million!
—	The belly is finally as big around as the head.
—	The brain weighs about 300 grams (a little less than ¾ pound).
—	Baby wieghs about 3,000 grams (about 6 pounds, 10 ounces).
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On January 08, 2008 the 8th month (28-32 wks) begins.

45 cm (18 inches)


—	After 40 million heartbeats, is a tuneup needed?
—	As fat stores increase, my wrinkles disappear. Thanks mom!
—	Feet now measure almost 2½ inches long (about 6 cm).
—	Breathing motions are common, even though there is no air in the womb.
—	The brain weighs about 200 grams (a little less than ½ pound).
—	Baby now weighs around 2,000 grams (almost 4½ pounds)!
—	The lifetime supply of the kidney's filtration units is now present.
—	The lungs produce "air pocket" cells from now until 8 years of age.
—	Prenatal food affects newborn taste preferences.
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On December 11, 2007 the 7th month (24-28 wks) begins.

40 cm (16 inches)


—	The thigh bone is about two inches long (about 5 cm).
—	baby now weighs about 1,000 grams (about 2 pounds, 3 ounces).
—	Baby's foot is now about two inches long (about 5 cm).
—	The eyes can detect low light and see in color.
—	The ability to smell has arrived.
—	The fetus can taste.
—	Between now and birth, brain weight increases 400% to 500%.
—	The eyes can produce tears.
—	The head is about the size of a softball.
—	Pupils react to light—just like newborns and big kids.
—	Body weight typically doubles from now until end of pregnancy.
—	Breathing motions are getting deeper and taking longer.
—	Baby now weighs about 1,500 grams (about 3 pounds, 5 ounces).
—	Baby can distinguish sounds of different frequencies.
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On November 13, 2007 the 6th month (20-24 wks) begins.

35 cm (14 inches)


—	Sometimes the eyes move rapidly just like eye movements seen in grownups having dreams.
—	Baby now weighs around 500 grams (about 1 pound, 2 ounces).
—	Starting this week, if born prematurely, survival is possible.
—	Heart beat count now exceeds 30 million beats!
—	The two sides of the brain are no longer symmetrical.
—	Sometimes breathing motions occur up to 44 times per minute.
—	The brain weighs about 100 grams (a little less than ¼ of a pound).
—	Sudden, loud noises trigger a blink-startle response.
—	The lungs produce a substance necessary for breathing after birth.
—	Loud noise increases movement, heart rate, and swallowing.
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On October 16, 2007 the 5th month (16-20 wks) begins.

28 cm (11 inches)


—	The fetal heart has now beat has more than 20 million times!
—	The head is about as big around as the average woman's wrist.
—	Sweat glands have arrived.
—	Certain movements in the larynx are similar to that of speaking.
—	A greasy white substance protects the skin from the amniotic fluid.
—	Girls’ ovaries now contain their lifetime supply of “egg” cells.
—	Melanin begins forming.
—	Movement, breathing, and heart rate follow daily rhythms.
—	The head is now the size of a tennis ball.
—	Hearing begins, as does response to sound.
—	All skin layers and structures are complete.
—	The eyelids separate, and eyes open and close.
—	Rapid eye movement occurs, just like adults when they dream.
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On September 18, 2007 the 4th month (12-16 wks) begins.

21 cm (8.3 inches)


—	The fetus is making more hormones all the time.
—	The entire fetus (except for parts of the scalp) responds to light touch.
—	Teeth are growing.
—	Girls open and close their jaws more often than boys of the same age.
—	Girls move their jaws more often than the boys do.
—	A pregnant mom may feel kicking for the first time.
—	If touched near the mouth, the face turns toward the side touched.
—	Girl fetuses move their jaws more often than boys do.
—	Nutrients in the amniotic fluid are broken down by digestive enzymes.
—	Blood cells begin replicating inside the bone marrow—just like big kids!
—	The head is bigger than a golf ball.
—	Baby's foot is now about one inch long (about 2½ cm).
—	Body fat emerges throughout the body.
—	Enamel begins forming on the developing teeth.
—	Air passages within the lungs are all formed.
—	The thigh bone (femur) is now about an inch long (or 2.5 cm).
—	The fetus produces stress hormones when poked with a needle.
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On September 11, 2007 the 12th week begins.

12 cm (4.7 inches


—	Weight increased by 60% this past week.
—	There are taste buds all over the mouth.
—	Hands touch the mouth as many as 50 times per hour.
—	Many different hormones are present.
—	Arms reach their final proportion to body size.
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On September 04, 2007 the 11th week begins.

10 cm (3.7 inches)


—	The face now makes complex expressions.
—	Now you can tell if it's a girl or boy!
—	Intestines absorb water and glucose from swallowed amniotic fluid.
—	The nose and lips are completely formed.
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On August 28, 2007 the 10th week begins.

8 cm (3 inches)


—	Yawning begins. (9 wks, 4 days)
—	Vocal cords are developing. (9 wks, 4 days)
—	Body weight increased more than 75% just this week!
—	Bones are hardening throughout the body.
—	Fingernails and toenails begin to grow!
—	The right and left sides of the brain are connecting.
—	Tiny folds in the skin form unique fingerprints.
—	The eyes roll downward after stimulation of the upper lid.
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On August 21, 2007 the 9th week begins.

6 cm (2.4 inches)


—	The mouth opens and closes, and the tongue moves.
—	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 August 14, 2007 the 8th week begins.

4 cm (1.7 inches)


—	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).
—	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 August 07, 2007 the 7th week begins.

2 cm (0.8 inches)


—	Brainwave activity is reported. (6 wks, 2 days)
—	Collar bones and jaw bones begin to harden. (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 July 31, 2007 the 6th week begins.

12 mm


—	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 July 24, 2007 the 5th week begins.

8 mm


—	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 July 17, 2007 the 4th week begins.

3 mm


—	The heart begins beating! (3 wks, 1 day)
—	Part of the thyroid gland appears. (3 wks, 1 day)
—	The amnion surrounds the embryo with a fluid-filled sac. (4 wks)
—	The umbilical cord is in place. (4 wks)
—	A tiny trachea or windpipe is forming. (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 July 10, 2007 the 3rd week begins.

1 mm


—	The early heart can be seen. (20 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)
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On July 03, 2007 the 2nd week begins.

0.1 mm


—	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 June 26, 2007 the first week begins.

Size: 0.1 mm


—	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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