Fetal development timeline

Fetal Development Timeline

By mary.c.simcox
  • Start

    Start

    Fertilization

  • Fertilized Egg

    Begins when a sperm penetrates the ovum.

  • Zygote Stage Begins

    Occurs when a sperm fertilizes the ovum.
  • Day 1 Hour 12

    Day 1 Hour 12

    Pronuclei Join Together
  • Day 2 Hour 9

    Day 2 Hour 9

    First Round of Mitosis (Cleavage)
  • Day 2 Hour 16

    Day 2 Hour 16

    Second Round of Mitosis
  • Day 3 Hour 7

    Day 3 Hour 7

    Morula Formed
  • Hatching

    Hatching

  • Day 5 Hour 1

    Day 5 Hour 1

    Ectopic Pregnancy Could Occur
  • Day 6 Hour 1

    Day 6 Hour 1

    64 Cell Embryo Called a Blastocyst
  • Day 9 Hour 1

    Day 9 Hour 1

    Implantation

  • Day 12 Hour 1

    hCG begins to be secreted
  • Day 12 Hour 2

    Day 12 Hour 2

    Disc with streak on the underside forms mesoderm

  • Day 15 Hour 1

    First Missed Period
  • Day 18 Hour 1

    Day 18 Hour 1

    Neural tubes form
  • Day 18 Hour 2

    Day 18 Hour 2

    Heart begins to beat, arm & leg buds appear, yolk sac makes RBCs
  • Day 35 Hour 1

    Day 35 Hour 1

    Facial plates forming

  • Embryo Stage Begins

    Occurs when the organism reaches 5 weeks after gestation and continues multiplication and development of cells.
  • Day 36 Hour 1

    Day 36 Hour 1

    Cleft lip or palate may occur
  • Week 6 Day 42 Hour 1

    Week 6 Day 42 Hour 1

    Muscles form, bent neck, webbed hands and feet, segmented back
  • Week 7 Day 49 Hour 1

    Week 7 Day 49 Hour 1

    Fingers & toes separate, eyes & ears formed
  • Day 50 Hour 1

    Day 50 Hour 1

    Genitalia begins to differentiate, eyelids fuse, amnion surrounds fetus

  • Fetal Stage Begins

    Occurs when the organism reaches 8 weeks after gestation and all the organs are developed only in need of growth.
  • Day 70 Hour 1

    Day 70 Hour 1

    Chorionic villi sampling could be performed
  • Day 100 Hour 1

    Day 100 Hour 1

    Amniocentesis could be performed
  • Week 26 Day 182 Hour 1

    Week 26 Day 182 Hour 1

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