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Conception happens when a sperm penetrates the waiting egg. It does this by releasing enzymes that help to break down the protective cells covering the egg.

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If one sperm does make its way into the fallopian tube and burrows into the egg, it fertilizes the egg. The egg changes so that no other sperm can get in.

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At the instant of fertilization, your baby's genes and sex are set. If the sperm has a Y chromosome, your baby will be a boy. If it has an X chromosome, the baby will be a girl.

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The process of prenatal development occurs in three main stages.
1. Germinal stage
2. Embryonic stage
3.Fetal Stage

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The beginning of the third week after conception marks the start of the embryonic period, a time when the mass of cells becomes distinct as a human. The embryo begins to divide into three layers each of which will become an important body system.

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Begins at conception when the sperm and egg cell unit. The fertilized egg, known as zygote then moves toward the uterus.

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Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as a fetus. This period of develop begins during the ninth week and lasts until birth. The early body systems and structures established in the embryonic stage continue to develop. The neural tube develops into the brain and spinal cord and neurons form. Sex organs begin to appear during the third month of gestation. The fetus continues to grow in both weight and length, although the majority of the physical growth occurs in the later stages of pregnancy.

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"Early Labor Phase –The time of the onset of labor until the cervix is dilated to 3 cm.
Active Labor Phase – Continues from 3 cm. until the cervix is dilated to 7 cm.
Transition Phase – Continues from 7 cm. until the cervix is fully dilated to 10 cm". Welcome to this world baby!

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Broderick, P. C. , & Blewitt, P. (2015). The file Span:  Human Development for Helping Professionals (4th ed). Boston:  Pearson.
Cherry, K. (2016). Stages of Prenatal Development. Retrieved from:  https://www.verywell.com/stages-of-prenatal-development-2795073
William’s Obstetrics Twenty-Second Ed. Cunningham, F. Gary, et al, Ch. 17. Retrieved from:  http://www.webmd.com/baby/understanding-conception#1