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Pregnancy and the Trimesters

Pregnancy and the Trimesters. First trimester. Conception – 4 weeks 8 weeks 12 weeks. Second trimester. 16 weeks 20 weeks 24 weeks. Third trimester. 28 weeks 32 weeks 36 - 38 weeks. First trimester Conception – 4 weeks. Less 1/10 inch long

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Pregnancy and the Trimesters

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  1. Pregnancy and the Trimesters

  2. First trimester • Conception – 4 weeks • 8 weeks • 12 weeks Second trimester • 16 weeks • 20 weeks • 24 weeks Third trimester • 28 weeks • 32 weeks • 36 - 38 weeks

  3. First trimesterConception – 4 weeks • Less 1/10 inch long • Beginning of spinal cord, nervous system, heart, intestinal system and lungs • Amniotic Sac – clear fluid, in which the unborn baby floats and moves

  4. First trimester 8 weeks • Less than 1 inch • Face forming – eyes, ears, mouth • Arms and legs are moving • Heartbeat detectable

  5. First trimester12 weeks • 3 inches and weighs 1 oz • Moving fingers and toes • Finger prints • Can smile, frown, swallow and urinate

  6. Second trimester16 weeks • 5 ½ inches long, 4 oz • Strong heartbeat • Thin skin • Downy hair over body • Fingernails and toe nails develop

  7. Second trimester 20 weeks • 10-12 inches • Sucks thumb • Hiccup • Hair, eyelashes and eyebrows • Rolls over fluid

  8. Second trimester24 weeks • 11-14 inches 1 ½ lbs • Wrinkled skin • Open eyes • Strong grip

  9. Third trimester 28 weeks • 14-17 inches, 2 ½ - 3 lbs • Adding body fat • Very active

  10. Third trimester 32 weeks • 16 ½ - 18 inches, 4 – 5 lbs • Sleep/awake • Responds to sounds

  11. Third trimester 36-28 weeks • 19 inches 6lbs • Skin less wrinkled • Gaining immunities from mother

  12. Period of prenatal development • Embryonic Period • Occurs 2-8 weeks after conception • Rate increases of cell division, support systems for the cells form, organs appear • Germinal period • Takes place in first 2 weeks after conception • Creation of zygote (fertilized egg), cell division attachment of the zygote to the uterine wall

  13. Period of prenatal development • Embryonic Period • Occurs 2-8 weeks after conception • Rate increases of cell division, support systems for the cells form, organs appear • The mass of cells attached to the uterine wall forms three layers and is now called the embryo • Endoderm – inner layer of cells will develop into digestive and respiratory systems • Ectoderm – outer layer of cells will become the nervous systems and sensory receptors (ears, nose, eyes and skin) • Mesoderm – middle layer – will develop into the circulatory system, bones, muscle, excretory system and reproductive system

  14. Period of prenatal development • Fetal Period • 2 months of conception • Last for 7 months • Development is very dramatic

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