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Prenatal Development

Prenatal Development. Chapter 4-1 Child Development. Prenatal Development. How Conception Occurs Inner lining of uterus thickens Every 28 days, an ovum is released into fallopian tubes If a sperm fertilizes the egg while in the fallopian tube… CONCEPTION occurs. Prenatal Development.

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Prenatal Development

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  1. Prenatal Development Chapter 4-1Child Development

  2. Prenatal Development • How Conception Occurs • Inner lining of uterus thickens • Every 28 days, an ovum is released into fallopian tubes • If a sperm fertilizes the egg while in the fallopian tube… • CONCEPTION occurs

  3. Prenatal Development • Time Frames • Ovum usually lives for 24-48 hours • Sperm is capable of fertilizing for 48 to 72 hours • During a woman’s cyle, there are 3-4 fertile days each month

  4. Fertilization of an Egg

  5. Real Life Pictures of Ovulation

  6. Prenatal Development • Germinal Stage • Lasts about two weeks • Cell division begins while still in the fallopian tube • After about 4 days, zygote reaches the uterus and implants • Zygote is the size of the head of a pin

  7. Prenatal Development • Embryonic Stage • Lasts from 3rd through 8th weeks • Embryo grows rapidly • Lots of changes occur

  8. Ultrasounds – 3 weeks, 8 weeks

  9. Prenatal Development • Organs and Body Systems Develop • Cells separate and turn in to major systems of body • Neural tube (becomes the brain/spinal cord) develops at 27 days after conception • Brain then takes over development • Very sensitive to drugs and alcohol

  10. Prenatal Development • Amniotic Sac • Sac filled with fluid forms around the embryo • Amniotic fluid protects the baby • Cushions the baby from bumps or falls • Embryo is about 1” long • Floats freely in fluid

  11. Prenatal Development • Placenta and Umbilical Cord • Placenta absorbs oxygen and nourishment from mother • Sends to baby through umbilical cord • takes carbon dioxide and other waste away • Placenta and umbilical cord provide everything baby needs until birth

  12. Prenatal Development • Umbilical cord • Thick and firm • Like a garden hose filled with water • Usually not flexible enough to loop around fetus

  13. Prenatal Development • Fetal Stage • From 8th week until birth • Baby is called “fetus” • Buds for 20 baby teeth appear • Vocal chords develop • Digestive system works • Spontaneous movements begin

  14. Prenatal Development • When can Baby live outside the womb? • At Month 7, with help • Baby gains weight • Adds fat • What does the fat do? • Helps keep Baby warm after birth

  15. Prenatal Development • What else is Baby up to? • Suck its thumb • Cough, sneeze, kick • Cry! • Still can change positions • As baby grows bigger • Baby runs out of room and assumes “fetal position” • Can no longer change positions

  16. 3 Weeks

  17. 8 Weeks

  18. Biology of Prenatal Development video • http://www.ehd.org/shoppingcart/products/The-Biology-of-Prenatal-Development.html • Ovulation video • http://www.youtube.com/watch?v=nLmg4wSHdxQ • Graphic Medical Photos of Cervix, Uterus, etc… • http://library.med.utah.edu/WebPath/FEMHTML/FEMIDX.html#2 • Nova Life’s Greatest Miracle • http://www.pbs.org/wgbh/nova/body/life-greatest-miracle.html • Nova’s Stem Cells • http://www.pbs.org/wgbh/nova/body/stem-cells-research.html

  19. Prenatal Development and Fruit Child DevelopmentSource: BabyCenter.com

  20. 4 Weeks • 4 Weeks: Baby -- now officially an embryo -- is about the size of a poppy seed.

  21. 5 Weeks • 5 weeks: Baby has grown to the size of a sesame seed, looking more like a tiny tadpole than a human.

  22. 6 Weeks • 6 weeks: Baby is as long as a lentil (about 1/4 inch).

  23. 7 Weeks • 7 weeks: Baby, having doubled in size since last week, is as big as a blueberry (about 1/2 inch in length).

  24. 8 Weeks • 8 weeks: Baby -- now comparable to the size of a kidney bean (just over 1/2 inch long) -- is constantly moving and shifting.

  25. 9 Weeks • 9 weeks: Baby has grown to the size of a grape, weighs a fraction of an ounce, and is almost 1 inch long.

  26. 10 Weeks • 10 weeks: Baby, now barely the size of a kumquat, weighs less than a quarter of an ounce. (Length: a little over 1 inch, head to bottom.)

  27. 11 Weeks • 11 Weeks- Baby is now about as big as a fig. (Length: just over 1 1/2 inches, head to bottom.)

  28. 12 Weeks • 12 weeks: Baby is, by this time, the size of a lime and weighs 1/2 ounce. (Length: just over 2 inches, head to bottom.)

  29. 13 Weeks • 13 weeks: Baby has reached the size of a medium shrimp and weighs nearly an ounce. (Length: almost 3 inches, head to bottom.)

  30. 14 Weeks • 14 weeks: Baby, now as long as a lemon, weighs about 1 1/2 ounces. (Length: 3 1/2 inches, head to bottom.)

  31. 15 Weeks • 15 weeks: Baby has grown to the size of an apple and weighs about 2 1/2 ounces. (Length: 4 inches, head to bottom.)

  32. 16 Weeks • 16 weeks: Baby measures up to an avocado, now, and weighs 3 1/2 ounces. (Length: 4 1/2 inches, head to bottom.)

  33. 17 Weeks • 17 weeks: Baby weighs 5 ounces this week -- about as much as a turnip. (Length: 5 inches, head to bottom.)

  34. 18 Weeks • 18 weeks: Baby is as big as a bell pepper and weighs almost 7 ounces. (Length: 5 1/2 inches, head to bottom.)

  35. 19 Weeks • 19 weeks: Baby equals a large heirloom tomato in size and weighs 8 1/2 ounces. (length: 6 inches, head to bottom)

  36. 20 Weeks • 20 weeks: Baby has grown as big as a banana. (Length: about 6 1/2 inches from head to bottom, and 10 inches from head to heel.)

  37. 21 Weeks • 21 weeks: Baby -- currently the length of a carrot -- weighs about 3/4 of a pound. (Length: 10 1/2 inches, head to heel.)

  38. 22 Weeks • 22 weeks: Baby has stretched to the size of a spaghetti squash and weighs almost a pound. (Length: nearly 11 inches.)

  39. 23 Weeks • 23 weeks: Baby weighs about as much as a large mango -- just over a pound. (Length: more than 11 inches.)

  40. 24 Weeks • 24 weeks: Baby is the size of an ear of corn and has caught up with an ear of corn in size and gained about 1/4 pound since last week. (Length: almost a foot.)

  41. 25 Weeks • 25 weeks: Baby is the size of a rutabaga and rivals the average rutabaga in weight -- about 1 1/2 pounds. (Length: 13 1/2 inches, head to heel.)

  42. 26 Weeks • 26 Weeks- Baby is as tall as an English hothouse cucumber and weighs about 1 2/3 pounds. (Length: 14 inches, head to heel.)

  43. 27 Weeks • 27 weeks: Baby is the size of a hefty as a head of cauliflower, weighing in at almost 2 pounds. (Length: about 14 1/2 inches.)

  44. 28 Weeks • 28 weeks: Baby is equal in weight to a Chinese cabbage -- about 2 1/4 pounds. (Length: almost 15 inches, from head to heel.)

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