prenatal stages

embryo

The developing ball of cells is now called an

implantation

Around seven days after conception, the ball of cells starts to become embedded in the wall of the uterus. This process is called

embryonic stage

In this stage, all the major organs form, and the embryo becomes very fragile

zygote

Conception occurs when a sperm cell combines with an egg cell to form a

placenta

One key feature of the germinal stage is the formation of a tissue called the

fetal stage

The last stage of prenatal development is

germinal stage

The two-week period after conception

prenatal period

This period is generally divided into three stages: the germinal stage, the embryonic stage, and the fetal stage.

Blastocyst

a hollow ball of about 150 cells

organogenesis

every major organ takes shape, in it's primitive form

implantation

fails, as is quite common, the pregnancy terminates.

embryonic stage

lasts from the end of the germinal stage to two months after conception

fetal stage

lasts from two months after conception until birth

embryonic period

occurs from the third to the eighth week after conception

prenatal period

the time between conception and birth

Miscarriage

spontaneous abortion that happens between 8% and 30%

twenty-two to twenty-six weeks after conception

the fetus reaches the age of viability

About thirty-six hours after conception

the zygote begins to divide quickly