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The fetus is roughly the size of a pinhead.
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The brain, spinal cord, internal organs, and circulatory system are developing at this stage.
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The lining of the uterus and the egg are now attached.
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At this stage, the baby is now roughly a quarter inch in size.
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The bones begin development as the limbs, eyes, ears, and face take shape.
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The embryo is still attached to the wall of the uterus.
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The baby is now an inch long.
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The lips, mouth, eyelids, and nostrils now form, as the buds for the teeth also begin to appear.
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At this point the fetus is no longer attached to the uterus wall.
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The fetus is now roughly 1 ounce and 3 inches long.
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Facial features begin to appear.
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It can now move around, swallow hiccup and suck its thumb.
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Fetus now weighs 4-5 ounces and is 6.5-7 inches long.
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The organs mature as the eyelashes, eyebrows, and hair appear. The teeth also continue growing.
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The fetus now becomes more active.
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It is now 8-12 ounces and 8-10 inches long.
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Fat begins forming under the skin.
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The fetus looks wrinkled and breathing begins.
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It is now 1.5 - 2 pounds and 10 - 12 inches long.
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Organs have almost fully matured.
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Has periods of both intermittent rest and activity.
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It is now 14 - 16 inches long and weighs 2.5 - 3 pounds.
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Organs are now almost fully mature.
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It now gains weight rapidly, can react to loud noises, and goes into a head-down or fetal position.
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It is now 5 - 6 pounds and 17 - 18 inches long.
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Continues to gain weight and the skin becomes smoother.
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Descends into pelvis, reduces movement due to lack of room, and obtains the mother's antibodies for fighting disease.