-
Hour 12
Fertilization -
Hour 50
Morula formed -
Hatching
-
Hour 12
Pronuclei join together -
Fertilized Egg
Begins to exist when sperm joins with an egg and meiosis is completed to form the ovum -
Zygote Stage Begins
Pronuclei join together -
Hours 30-36
First round of mitosis (cleavage) -
Hour 40
Second Round of Mitosis -
Hour 50
Third Round of Mitosis -
Embryo Stage Begins
Occurs when the third round of mitosis happens, forming the morula -
Day 21
Heart begins to beat -
Day 6
64 cell embyro called blastocyst -
Fetal Stage Begins
Occurs when a blastocyst forms and outer cells become to placenta -
Day 10
Implantation -
Day 12
Disk with streak on the underside forms mesoderm -
week 4
ectopic pregnancy can occur -
Week 2
HCG begins to be secreted -
Day 15
First missed period -
Day 35
Face plates forming -
Week 6
neural tube forms -
Week 6
Muscles form, bent neck, webbed hands and feet, segmented back -
Week 7
Cleft lip or palate may occur -
Week 7
Fingers and toes separate, eyes and ears formed -
Day 50
Genitalia begins to differentiate, eyelids fuse, amnion surrounds fetus -
Week 9
Chorionic villi sampling could be performed -
Week 14
Amniocentesis could be performed -
7 months
Eyes, open, fat added under skin, head out of proportion to the body
