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Fetal Period

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Crown-heel length (CHL, standing height ) Monthly changes. Growth of head ... diameter (BPD), head & abdominal circumference, & femur length in the 16th to 30th weeks ... – PowerPoint PPT presentation

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Title: Fetal Period


1
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2
Development of the Fetus
  • Fetal period
  • Crown-rump length (CRL, sitting height )
  • Crown-heel length (CHL, standing height )

3
Monthly changes
  • Growth of head
  • At the beginning of the 3rd month
  • By the beginning of the 5th month
  • At birth

4
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5
Monthly changes
  • During the 3 rd month
  • Face
  • Eyes
  • Ears
  • Limbs
  • Primary ossification centers
  • External genitalia
  • Intestinal loops
  • Muscular activity

6
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7
Monthly changes
  • During the 4 th 5 th months
  • The length of fetus
  • The weight of fetus
  • Lanugo hair
  • Movements of fetus

8
Monthly changes
  • During the 6 th month
  • Skin
  • A fetus born early in the 6th month

9
Monthly changes
  • During the last 2 months
  • Contours
  • Vernix caseosa
  • At the end of the 9 th month
  • CRL
  • CHL
  • Weight
  • Sexual characteristics
  • Testis

10
Time of birth
  • Length of pregnancy
  • The day of delivery is not always easy to
    determine.
  • ?
  • ?
  • ?

11
Time of birth
  • Naegeles rule
  • Month 9 (or - 3) Day 7 from the 1st day of
    LNMP
  • Most fetuses are born within 10 to 14 days of the
    calculated delivery date.
  • Premature postmature
  • By combining data on the onset of the last
    menstrual period with fetal length, weight,
    other morphological characteristics typical for a
    given month of development, a reasonable estimate
    of the age of fetus can be formulated.

12
Time of birth
  • Ultrasound
  • CRL during the 7th to 14th weeks
  • Biparietal diameter (BPD), head abdominal
    circumference, femur length in the 16th to 30th
    weeks
  • ? An accurate determination of fetal size age
    is important for managing pregnancy, especially
    if the mother has a small pelvis or the baby has
    a birth defect.
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