fetal age & gender determination
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Fetal Age & Gender DeterminationTurki M. Alanazi
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Objective Fetal sex & age determination.
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End of 1st MonthI. Length: 1 cm, weight: 2.5 g.II. Eyes are seen as 2 dark spots and mouth as cleft
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End of 2nd MonthI. Length: 4 cm, weight: 10 g.II. Eyes and nose recognizable, hands and feet are webbed. Anus
is seen as dark spot. Placenta is formed.
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End of 3rd monthI. Length 7.5 – 10 cm.II. Limbs are well developed.III. Neck is formed.IV. Finger toes visible.
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End of the 4th monthI. Sex can be recognized.
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End of the 5th week I. Length 17.5 – 20 cm.II. Eye brows are absent.III. Meconium is present in the stomach.
is the earliest stool of a mammalian infant.
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End of the 7th monthI. Length 35 cm.II. Weight 0.9 g – 1.2 kg.III. Nails are thick.IV. Eyelids open and papillary
membrane disappears.V. Meconium is found in the
large intestine.VI. Testes are found at external
inguinal ring.
VII.Placenta weight 350-400.
VIII. Vernix Caseosa is present.
is the waxy or cheese-like white substance found coating the skin of newborn human babies.
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End of 8th month I. Length 40 cm.II. Nails reach the tip of finger.III. Left testis is present in the scrotum.IV. Placenta weight 500 g.
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End of the 9th month I. Length 45 cm.II. Anterior fontanelle is closed. III. Scrotum is wrinkled and contain both testes.IV. Placenta weighs 500 g.
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End of the 10th month I. Length 50-53 cm. II. Grown rump- length 30-33 cm. III. Weight 2.5 – 5 kg.IV. Lanugo absent except on shoulder.V. The center of ossification is found for lower end of femur.VI. Nails extend beyond the finger tips at the end of 40 weeks
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Rule of Hasse It is a rough method of calculating the age of fetus.
I. The length of fetus is measured from crown to heel in centimeters.
II. During first 5 months of pregnancy—square root of length gives approximate age of fetus in months.
III. During the last 5 months—length in centimeter divided by 5 gives age in months.
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Resources
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