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  Zygote implants into uteran lining
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  Lasts 2 weeks to 8 weeks; 1/2 inch long and Nervous system develops
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  Now called a Fetus, heart, head, brain rapidly develop
 Digestive system forms
 1 inch long,
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  Rapid head growth, bones form, digestive organs function and arms, legs and fingers move spontaniously
 Fetus is 3 inches long and weighs about 1 ounce
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  lower body growth rapid
 heartbeat can be heard by Doctor
 sex organs fully formed
 Fetus is 7 inches long and weighs 5 ounces
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  Mother feels movement
 Ears and nose begin cartlidge development
 fingernails and toenails appear
 12 inches long and weighs 14 ounces
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  Eyes and eyelids fully formed
 fat develops under skin
 14 inches long and weighs 2 pounds