Fetal Development Chart
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Fetal Development Chart
Period of
the Ovum
1-2

Period of the Embryo (in weeks)
3

5

4

6

Period of the Fetus (in weeks)
8

7

16

12

20-36

38

= Most common site of birth defects
Eye

CNS
Eye

Ear

Palate

Heart

Ear

Brain

Arm
Teeth
Leg

External Genitalia

Central Nervous System (CNS)
Heart
Arms
Eyes
Legs
Teeth
Palate
External Genitalia
Ears

Vulnerability of the fetus to defects during different periods of development. The dark blue portion of the bars represents the most sensitive
periods of development, during which teratogenic effects on the sites listed would result in major structural abnormalities in the child. The lighter
blue portion of the bars represents periods of development during which physiological defects and minor structural abnormalities would occur.
SOURCE: Adapted from Moore 1993.
National Organization on Fetal Alcohol Syndrome (NOFAS)

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Augus