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Prenatal development is most dramatic during the fetal stage. When the embryo becomes a fetus at eight weeks, it is approximately 3 centimeters (1.2 inches) in length from crown to rump and weighs about 3 grams (0.1 ounces). By the time the fetus is considered full-term at age 38 weeks gestation, he or she may be 50 centimeters (20 inches) or 3.3 kilograms (7.3 pounds). Although all of the organ systems were formed during embryonic development, they continue to develop and grow during the fetal stage.

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Makes up the first trimester and is critical stage for "normal" cognitive and physical development. In addition, the unborn baby is particularly susceptible to health problems (less able to protect itself from illness and every little thing can have severe consequences down the line. The embryonic stage begins after implantation and last until eight weeks after conception. Soon after implantation, the cells continue to rapidly divide and clusters of cells begin to take on different functions.

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Within a few hours after conception, the single celled zygote begins making a journey down the Fallopian tube to the uterus where it will begins the process of cell division and growth. The zygote first divides into two cells, then into four, eight, sixteen, and so on. Once the eight cell begin to differentiate and take on certain characteristics that will determine the types of cells they will eventually become

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Month 7
- Baby weighs about 1 1/2 to 2 lbs and is about 10-12 inches long
- Fetus is active and then rests
Month 8
-May have turned head-down in preparation for birth
- Fetus may react to noise with jerking actions
Month 9
- Fetus has now dropped into pelvis and is ready for birth

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Month 4
- Fetus can suck thumb, swallow, hiccup and move
- Facial features are more clear
Month 5
- Fetus is about 8-10' long weighing almost a pound
- Fetus is more active
Month 6
- Baby's lungs are filled with amniotic fluid, and he/she has started breathing motions

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Month 1
- Begins on the first day of your last period and lasts until the end of week 12
Month 2
- Egg attaches to the uterus lining
- Embryo is about 1/4 inches long, and has distinct, slightly webbed fingers
Month 3
- All organs and muscles of fetus have formed but are immature
- Fingers and toes are almost complete