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size of pin head, egg attaches to uterus, critical stage of brain/spinal cord development, heart begins to beat
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1/4 inch, face/eyes/limbs begin to form, bones begin to form
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one inch, nostrils/mouth/lips/eyelids form, buds for all 20 baby teeth appear, fingers and toes almost complete, organs present but immature
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three inches, one ounce, sucks thumb, swallow, hiccup, moves, facial features become clearer
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6 1/2-7 inches, 4-5 ounces, hair/eyelashes/eyebrows appear, teeth continue to develop, organs mature, becomes more active
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8-10 inches, 8-12 ounces, fat deposits under skin, fetus appear wrinkled, breathing movements begin
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10-12 inches, 1 1/2-2 pounds, sleeps and wakes regularly
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14-16 inches, 2 1/2-3 pounds, rapid weight gain, reacts to loud noses/light changes, moves into head-down position
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17-18 inches, 5-6 pounds, weight gain continues, skin becomes smooth as fat deposits continues, movements slow as there gets less room to move, disease fighting antibodies form, descends into pelvis, ready for birth
