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Fertilization
Hour 1 -
Hour 12
Pronuclei join together -
Fertilized Egg
The egg and the sperm combing together, 23 egg chromosomes of the female and 23 sperm chromosomes join together to form the baby's new 46 chromosomes. -
Zygotic stage begins
Nuclear membrane of the ovum disappears and the 23 chromosomes of the sperm joins together the 23 chromosomes of egg. -
Hour 30
First Round of Mitosis (Cleavage) -
Hour 40
Round Two of Mitosis (Cleavage) -
Hour 50
Third Round of Mitosis (Cleavage) -
Embryo Stage Begins
Occurs after the 8th week after conception, after the third mitosis. -
Morula Formed
8 cells -
Day 6
64 Cell Embryo called a Blastocyst -
Day 8
Implantation -
Day 10
Ectopic Pregnancy Could Occur -
Hatching
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Day 12
hCG begins to secrete -
Day 12
Disc with streak on the underside forms Mesoderm. -
Day 15
First missed period. -
Day 16
Neural Tube Forms -
Day 22
Heart beings to beat, arm and leg buds appear, yolk sac makes RBCs -
Day 34, 35, and 36
Face plates forming. -
Day 36
Cleft Lip or cleft palate may occur -
Week 6
Muscles, Neck, Hands and Feet, and Back -
Week 7
Fingers and toes separate, eyes and ears formed. -
Day 50
Chorionic Villi Sampling could be Performed -
Day 50
Genitalia begins to Differentiate -
Fetal stage begins
Occurs when all organs are formed -
Week 9
Amniocentesis could be preformed -
Month 6
Fat added under skin & Head out of proportion to the Body
