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Week 38 the fetus is considered full term.  The Mother prepares for birth in 3 stages: Stage 1 is the time it takes for the cervix to dilate to 10 cm.,  stage 2 is the actual delivery of the baby, and stage 3 is the delivery of the placenta.

During stage 2 the baby is also making steps to prepare for birth.  The baby's head will position to one side and the chin will rest on the its chest so the back of the head is the first to emerge. At full dilation, the baby's head leads the way through the birth canal while the head and torso begin to turn and face the mother's back side as it enters the vagina. The baby's head will begin to emerge through the vaginal opening. Once the head is out the baby turns its head and shoulders to the side allowing it to easily slip out.

In the case of complication, some women will give birth via C-section, surgically removing the baby from the womb.

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Weeks 9-16 the central nervous system is still very susceptible to terotagens.  The fetus continues to grow and begins to move and stretch and even make a fist.  The fetus's genitals appear along with nails on the fingers and toes.  Muscle tissue and bone continue to grow along with many other internal functions and external features.

Weeks 17-19 the fetus can hear.  It becomes more active and the mother may start to feel fluttering in the womb.

Weeks 20-38 the fetus continues to grow as internal systems and external features continue to develop.

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The Embryonic stage is from week 3 through week 8.  During this stage major systems and structures develop.  Cells begin to multiply and take on specific functions.  This process is called differentiation.  Differentiation leads to rapid growth of the embryo as the central nervous system begins to develop along with internal organs and external features.  During this time the embryo is highly susceptible to birth defects caused by terotagens. At week 9 it is considered a fetus.

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Soon after conception and the zygote is formed mitosis begins.  Mitosis is the process of cell division.  The zygote which holds all the genetic material from the sperm and the ovum divides into two new cells. Those two new cells then divide into four new cells. This process continues doubling the cells for about two weeks as it is traveling down the fallopian tube. Once it reaches the uterus implantation occurs. Implantation is when the multiple celled zygote attaches itself to the uterine lining.  Once it is implanted it is then considered an embryo.

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A zygote has 46 chromosomes, 23 from the father (sperm) and 23 from the mother (ovum). All chromosome pairs, called autosomes, look alike and act alike except for the 23rd pair. The 23rd pair is responsible for determining the sex of the fetus.  They are called the sex chromosomes.  The female zygotes have matching X chromosomes and the male zygotes have one x chromosome and one y chromosome.

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Conception occurs when one sperm reached the ovum and fertilized it.  To do so the sperm must work its way through the outer membrane of the ovum and find its way through the cytoplasm of the ovum until it reaches and penetrates the nucleus. When penetration occurs, the structure of the sperm then disintegrates and the sperm's chromosomes come together with the ovum's chromosomes creating a zygote.