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Life in the Womb

Life in the Womb. PED 392 Child Growth and Development. Timeline. Usually a 40 week system Can also be a 38 week system with week 1 being the 3 rd week of the 40 week system Broken into 3 trimesters Week 15 Week 28-29 Week 40. Week 1. Mothers last menstruation

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Life in the Womb

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  1. Life in the Womb PED 392 Child Growth and Development

  2. Timeline • Usually a 40 week system • Can also be a 38 week system with week 1 being the 3rd week of the 40 week system • Broken into 3 trimesters • Week 15 • Week 28-29 • Week 40

  3. Week 1 • Mothers last menstruation • In a 38 week system, this is week -2.

  4. Week 3 • The baby is created!!! • Fertilization of the egg • Implantation • In a 38 week system, this is week 1.

  5. Week 4 • Mothers missed period • Cell differentiation begins

  6. Week 5 • Length = 0.1 in • Brain, spinal cord, heart begin to develop • Gastrointestinal tract begins to develop

  7. Week 6 • Length = 0.2-0.3 in • Tissue for vertebrae forms • Heart beat is regular and blood flows • Brain develops into 5 areas • Arms and legs begin to develop

  8. Week 8 • Length = 0.5 in • Lungs begin to develop • Arms and legs continue to develop

  9. Week 9 • Length = 0.7 in • All essential organs are formed or have begun to form

  10. Week 10 • Length = 1.2 in • Pregnancy detectable by exam • Head looks human • Eyelids are developed • Ear begins to form externally

  11. Week 11 • Length = 2.0 in • Weight = 0.3 oz • Eyelids closed (wont open again until week 30)

  12. Week 12 • Length = 2.4 in • Weight = 0.5 oz • Form recognizable as human • Responds to stimulation • Fingernails begin to develop

  13. Week 14 • Length = 3.4 in • Weight = 1.6 oz • Essential organs formed • Circulatory system works • Sex is distinguishable • Fist can be made

  14. Week 16 • CONGRATULATIONS - its your 2nd trimester • Length = 4.7 in • Weight = 3.9 oz • Mother shows • Skeleton can be seen in x-ray • Toe-nails develop

  15. Week 18 • Length = 5.5 in • Weight = 7.1 oz • Baby can suck • Sex organs distinct • Meconium is made

  16. Week 20 • HALF WAY DONE!!! • Length = 6.3 in • Weight = 11.3 oz • Vernixcaseosa covers skin (white sticky substance) • Quickening can be felt by mother

  17. Week 22 • Length = 7.5 in • Weight = 1 lb • Head and body has hair • Babies movement increases

  18. Week 24 • HUGE WEEK!!!! • Length = 8.3 in • Weight = 1.4 lbs • survive outside womb POSSIBLE with help • Would need medical help for extended period

  19. Week 26 • Length = 9.1 in • Weight = 1.8 lbs • Eyes developed • Startle reflex • Foot and finger prints develop • Air sacs form in lungs

  20. Week 28 • ENORMOUS WEEK!!!! • Length = 9.8 in • Weight = 2.2 lbs • Survival outside womb PROBABLE with medical help

  21. Week 30 • BEGIN 3rd TRIMESTER • Length = 10.6 in • Weight = 2.9 lbs • Eyes open again • Storage of minerals begins • Iron, Calcium, Phosphorous

  22. Week 32 • Length = 11.0 in • Weight = 3.7 lbs • Fat forming on baby (until birth)

  23. Week 34 • Length = 11.8 in • Weight = 4.6 lbs • Fingernails grow to end of finger • Skin smooth

  24. Week 35 • MONSTEROUS WEEK!!!!! • SURVIVAL OUTSIDE WOMB EXPECTED • Without medical help

  25. Week 38 • Length = 13.4 in • Weight = 6.4 lbs • Body plump • Body hair gone • Firm grasp

  26. Week 40 • Length = 14.2 inches crown to rump 20 inches head to toe • Weight = 7.5 lbs • BABY IS DUE!!!! • Baby can come up to 2 weeks late • Usually a c-section is scheduled after 2 weeks

  27. Reference • Tallack, P. (2006). In The Womb. National Geographic Society. Washington D.C.

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