Conception:
The first cell of a new person is created!
Cell Division
"The genetic combination in the newly-fertilized egg will be totally unlike that of any person who has ever lived before or ever will be born afterwards-truly resulting in an absolute unique individual." Randy Guliuzz, P.E., M.D.
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Implantation
10 to 14 days from conception the fertilized egg, upon entering the uterus, attaches to the uterine lining, or endometrium.
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3-4 Weeks
About three weeks after ovulation, the baby's brain, spinal cord, heart, and other organs begin to form.
The heart begins beating during week three and four.
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Early Development
At 8 weeks the fetus is now well over ½ in long. The arms and legs are well formed.
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12 Weeks
The baby now measures 2 1/2 inches and moves on its own. Sex organs begin to become clear.
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16 Weeks
Fingerprints and fingernails, sex organs distinct, teeth buds found and the heart is fully formed.
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20 Weeks
Begin to feel baby kick. Baby can suck their thumb, make faces and yawn.
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 24 Weeks
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Baby has sleep and wake cycles. Soft white hair covers baby to keep them warm.
If born it now can survive.
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40 weeks
Pregnancies last between 38 and 42 weeks. Babies differ in size based on genetics, number of babies being carried and gender.
The above images are from the BabyCenter wesite: http://www.babycenter.com/pregnancy-fetal-development-index
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