Fetal Development


Fast Facts (Fetal Development)

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  • A human person’s life begins at fertilization when the father’s sperm penetrates the mother’s egg.
  • From the time of fertilization, a baby’s unique DNA and genetic makeup are complete from sex to hair color to height as an adult.
  • A baby’s heart begins to beat just three weeks after fertilization.
  • Brain waves can be detected at six weeks after fertilization.
  • At two months after fertilization, all of the baby’s organ systems are complete. The baby just needs to grow for the remainder of time in the womb.