Fetal Development Timeline

By meghowe714

  • Start

    Fertilization

  • Fertilized Egg

    Begins when the sperm meets the egg
  • Day 1, hour 12

    Day 1, hour 12

    pronuclei join together

  • Zygote Stage Begins

    Occurs when the pronuclei join together
  • Day 2 hour 6

    Day 2 hour 6

    First Round of Mitosis
  • Day 2, Hour 16

    Day 2, Hour 16

    Second Round of Mitosis
  • Day 3, Hour 2

    Day 3, Hour 2

    Third Round of Mitosis
  • Morula formed

    Morula formed

  • Embryo Stage Begins

    Occurs after the 3rd round of mitosis
  • Day 6

    Day 6

    64 Cell Embryo called a Blastocyst
  • Day 10

    Day 10

    Ectopic Pregnancy could occur
  • Hatching

    Hatching

  • Day 12

    Day 12

    Disk with streak on the underside forms mesoderm
  • Day 12

    Day 12

    Implantation

  • Day 12

    hCG begins to be secreted
  • Day 14-22

    Day 14-22

    Neural Tube Forms

  • Day 15

    First Missed Period
  • Day 21

    Day 21

    Heart begins to beat, arms & leg buds appear, yolk sac makes RBCs
  • Day 34, 35, 36

    Day 34, 35, 36

    Face Plates Form
  • Week 6

    Week 6

    Muscles form, bent neck, webbed hands and feet, segmented back
  • Week 6

    Week 6

    Cleft lip or palate may occur
  • Week 7

    Week 7

    Fingers & Toes separate, Eyes & Ears Formed

  • Fetal Stage Begins

    Occurs when all organs are formed
  • Day 50

    Day 50

    Genitalia begins to differentiate, Eyelids fuse, Amnion surrounds fetus
  • Week 9-11

    Week 9-11

    Chorionic Villi Sampling Could be Performed
  • Week 14-15

    Week 14-15

    Amniocentesis could be performed
  • Month 6

    Month 6

    Eyes open, fat added under skin, head out of proportion to the body