Pregnancy

• Zygote

  • Once an egg is fertilized by a sperm, it is called a zygote.
  • The zygote cell then starts to divide to form a ball of cells.
• Embryo

  • Once a ball of cells has formed, this is called an embryo.
  • The embryo then implants itself in the wall of the uterus.
• Placenta - A structure that connects the mother to the developing embryo.

  • A placenta forms between the embryo and the wall of the uterus.
  • The umbilical cord is a thick knot of blood vessels that connects the embryo and the placenta.
  • An amniotic sac filled with amniotic fluid forms around the embryo to protect it from damage in the uterus.
• Fetus

  • 6 weeks after fertilization, the embryo can be called a fetus.
  • The fetus continues to grow and become more complex.
  • The baby is fully formed at around 38 to 40 weeks.