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Fetal Development; Conception to Birth
Transcript of Fetal Development; Conception to Birth
By Paula Padilla Conception Conception normally occurs about two weeks after a woman's last period begins. The two weeks after a woman's period are added to figure out her due date (40 weeks in total) even though she's not technically pregnant at this time. Fertilization Fetal Development
Week 1 and 2 After sexual intercourse, the sperm and egg join together in one of the woman's fallopian tubes to make a single celled zygote. There can be more than one zygote. Soon after fertilization, the zygote travels down the fallopian tube toward the uterus. Human Sperm Human Egg http://www.mayoclinic.com/health/prenatal-care/PR00112
http://www.pregnancysymptomsweekbyweek.org/7_Weeks_Pregnant_Pregnancy_Symptoms Resources 23 chromsomes
The father's chromosomes determine the sex of the baby
Can survive in womb for 3-5 days
500 million sperm are released during ejaculation.
only 200 ever reach the egg 23 chromosomes
Much larger than the sperm; one of the largest cells in the human body
Healthy couples around ovulation have a 1 in 4 chance of getting pregnant after unprotected sex.
1-3 eggs can be released at one time Implantation a group of cells about the size of a poppy seed floats down the Fallopian tube to the uterus. About half will grow to be the fetus the other half will be the placenta. Week 3 and 4 Week 5 The embryo is about the size
of a sesame seed at this stage.
The heart is tiny but has started beating. The neural tube has started to develop. It eventual becomes the spinal cord and brain. Week 6 Jaw, cheeks, chin, eyes, ears, and nose are beginning to form
Heart beats at 80 times a minute
About a quarter of a inch long.
Arm and leg buds start to grow. Week 7 Baby is about the size of a blueberry and weighs 0.02 oz
Limb buds are growing rapidly.
Placenta is getting bigger and yoke sac is becoming smaller
Vital organs are starting to develop. Week 8 Week 9 The baby is about the size of a raspberry and weighs 0.04 oz or 1 gram.
Hands and feet are starting to develop but are still webbed.
The outer ear is beginning to form.
Eyes are getting larger and darker.
Yoke sac is dispearing and the placenta is becoming the main form of nourishment. About the size of a cherry and weighs 0.07oz.
Starts to make tiny movements.
Yoke sack continues to shrink.
Eyes are moving in to position in the head. Week 10 Week 11 Week 12 About the size of a strawberry and weighs 0.13oz.
Placenta is fully developed. and the umbilical cord exchanges blood between placenta and the embryo.
The wrists are now able to bend.
The fingers and toes have grown and separated. About the size of an apricot and weighs around 0.28oz.
Eyelids have developed but remain sealed shut until 26 weeks.
The ovaries or testes have started to develop.
However both sexes look the same at this point.
Ears have started to move to position.
Diaphragm can move and has developed.
Now called a fetus. Fetus is about the size of a lime and weighs around 0.51 oz.
Ears have moved to their final position.
Heart is beating at approximately 140-165 beats per minute.
Intestines have moved to the abdominal cavity.
Their mouth can move and swallow.
Finger can open and close. Week 13 Week 14 Week 15 Fetus is about the size of a plum and weighs 0.9oz. 3 inches
The inner ear have formed and your baby is now able to hears.
The amniotic sac contains fluid now.
The toes are fully separated and about the same length.
Fingerprints have developed.
Their head is about a third of their length. At this stage the baby is abut the size of a lemon and weighs 1.60 oz, 3.51 inches long.
Hair has started to grow on the head and eyebrows.
Now in the second trimester.
Kidneys are making urine now. About the size of a peach and weighs 2.56 oz at about 4.17 inches.
The inner ear have formed and the fetus is now able to hear.
Spinal cord has fully formed and extends the vertebrae. Week 16 About the size of an avocado and weighs 3.5oz. 4 1/2 inches long.
Started growing toenails.
Heart is now pumping about 25 quarts of blood each day. Week 17 About the size of an onion.
Skeleton is changing from cartilage to bone.
Fetus is practicing sucking and swallowing. Week 18 Is about the size of a sweet potato.
Is big enough for the mother to feel the movements of the baby.
Sexual organs have developed in place.
Can now tell the gender of the fetus. But they most likely wont cooperate. Week 19 Week 20 Arms and legs are in the right proportions to each other and the rest of her body now
A waxy protective coating called the vernix caseosa is forming on their skin to prevent it from pickling in the amniotic fluid.
Able to hear outside noises now. •7 inches long and weighs about 11oz
About the size of a pomegranate.
The skin is getting thicker
•The heart can now be heard with a stethoscope. Week 24 (6 months) About 1.39lbs the size of a coconut or a foot long.
The Lungs are developing as the respiratory passageways form.
Taste Buds are starting to develop.
Gaining about 6 ounces a week. Week 28 (month 7) 15 inches long and 2.29 lbs or about the size of a eggplant.
Eyes have opened since week 26. Baby can see some light filtering through the uterine wall.
Eyelashes have formed.
Baby is practicing breathing in amniotic fluid. Week 32 (month 8) About the size of a pine apple or 17.04 inches, 3.81 lbs.
The bones have just about reached their full pre-birth size.
Skin is becoming soft and smooth,
Toenails and fingernails have fully developed. Week 36 (month 8) •Baby is 16-1/2 to 18 inches long
Weight is about 4 to 6 pounds.
Overall growth is rapid this month.
Tremendous brain growth occurs at this time.
Most body organs are now developed, except for the lungs.
Movements or “kicks” are strong enough to be visible from the outside
Kidneys are mature. Week 40 Baby is 19 to 20 inches long.
Weight is about 7 to 7-1/2 pounds.
The lungs are mature
Baby is now fully developed and can survive outside the mother’s body.
Baby flips to prepare for birth. Birth! A new life!
After 40 weeks a baby is born.
First world average weight is 5.5-10lbs and height is 14-21 inches.
Average birth is 16 hours.