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Conception through 2 weeks

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amnion, placenta, and umbilical cord beginning to form

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amnion, placenta, and umbilical cord beginning to form

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2 weeks through 8 weeks

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internal organs (heart, liver, digestive system, brain, and lungs) developing

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internal organs (heart, liver, digestive system, brain, and lungs) developing

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tissue segments (future vertebrae) in a spinal column forming

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tissue segments (future vertebrae) in a spinal column forming

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limb buds (future arms and legs) appearing

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limb buds (future arms and legs) appearing

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limbs, hands, feet, fingers, and toes developing

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limbs, hands, feet, fingers, and toes developing