3. 2 to 3 Week
Embryo is 2mm is length
Groove forms along middle of
back
Blood circulation begins
Heart is tubular
Implantation process started.
3
4. 4 to 5 Week
Embryo is 4-6 mm in length
Weight is 0.4 gm
Double heart chamber are visible
Heart tubular in structure vessels are
begins to develop
Limb buds form
4
5. 6 to 8 Week
Length is 3 cm.
Weight is 2 gm.
Eyelids begin to fuse.
Circulatory system through umbilical cord and placenta is started.
Every organ system is present.
Lungs begin to form.
Lymphatic system begins to develop.
Kidney start to develop.
The neural tube closes.
Brains continues to develop.
Development of external genitalia starts.
5
6. 9 to12 Week
Fetus is 8 cm in length.
Weight is 40 to 50 gm.
Face is well formed.
Nipple and hair follicle begin to form.
The external features of the ear begin to take their final shape.
Limbs are long and slender.
Kidneys begin to form urine.
Spontaneous movement occurs.
Placenta and umbilical cord are completely formed and start their
function normally.
Heart beat is detected by doppler transducer.
Gender is visually recognize
All essential organs have at least begun.
6
7. 13 to 16 weeks
Length is about 15 cm.
Active movement are present.
Fetal skin is transparent.
Lanugo hair is begins to develop.
Skeletal ossification occurs.
Fingerprints and footprints are begins to
formed.
Sucking and swallowing reflex are present.
Meconium formed in the intestinal tract.
Heart muscles are well developed.
The liver and pancreas produce fluid secretions.
7
8. 17 to 20 weeks
Length is about 20 cm.
Weight is about 465 gm.
Lanugo covers the entire body.
Nails appear on fingers and toes
The fetus is more active with increased muscle
development.
Enamel and dentin are depositing.
The heart beat can be heard with a stethoscope or
fetoscope.
“Quickening” usually occurs (The mother and
others can feel the fetus moving)
8
9. 21 to 24 weeks
Length is about 28 cm (11.2 inches)
Weight is about 780 to 925 gm.
Hairs on head is well formed.
Eyebrows and eyelashes are developed(all eye
components are developed).
Skin is reddish and wrinkled.
Reflex hand grasp functions
Vernix caseosa covers entire body.
Fetus has ability to hear.
Alveoli (air sacs) are forming in lungs.
9
10. 25 to 28 weeks
Length is about 38 cm (15 inches)
Weight is about 1.2 Kg.
Limbs are well flexed.
Brain is developing rapidly.
The nervous system developed enough to
control some body function.
Eyelids open and close.
The respiratory system, while immature, has
developed to the point where gas exchange is
possible.
If born, neonate can breath at this time.
10
11. 29 to 32 weeks
Length is about 38 to 43 cm (15 to 17 inches)
Weight is about 1.5 Kg
Subcutaneous fat rapidly increases.
Rhythmic breathing movements occur, but lungs
are not fully mature.
Thalamic brain connections, which mediate
sensory input, form.
Bones are fully developed but are still soft and
pliable.
The fetus begins storing a lots of iron and
calcium and phosphorus.
11
12. 33 to 36 weeks
Length is about 40 to 48 cm.
Weight is about 2.5 Kg.
Lanugo begins to disappear.
Body fat increases.
The skin is pink and the body is rounded
The skin is less wrinkled.
Fingernails reach the end of the fingertips.
A baby born at 36 weeks has a high chance of
survival, but may require medical
interventions.
12
13. 37 to 40 weeks
Length Is about 48 to 53 cm (19 to 21 inches).
Weight is about 2.5 to 3.5 Kg.
The lanugo is gone except on the upper arms and
shoulders.
Fingernails extend beyond fingertips.
Head hair is now coarse and thickest.
The skin is pinkish and smooth.
Vernix caseosa decrease.
The testis are in the scortum.
The labia majora are well developed.
Now, The fetus is considered as full-term at the end of
the 39 weeks of gestational age.
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