Timeline of Fetal Development Survey When Does Life Begin?

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The Timeline of Fetal Development

Conception || First Trimester

Conception || First Trimester

  • Unique human DNA is present, distinct from the DNA of both mother and father. Only humans have human DNA.
  • Rapid growth is taking place. Only living beings grow.
  • The baby has either male or female chromosomes.
  • Nothing new will be added to this person from now until the moment he eventually dies. He will simply grow and develop.
3 Weeks || First Trimester

3 Weeks || First Trimester

  • Blood vessels have formed.
  • The baby’s heart began to beat at 18 days and is now pumping his unique blood, distinct from the blood of his mother, through his fully formed veins.
  • The foundations of the brain, spinal cord, and nervous system are all in place.
  • The baby’s eyes have begun to form.
  • This is the earliest the Mom might be able to determine that she is pregnant, via a pregnancy test or physical changes.
6 Weeks || First Trimester

6 Weeks || First Trimester

  • The brain has been divided into its 3 parts: emotion, hearing, and sight.
  • The part of the brain that controls complex thinking and reasoning, which is not present in any mammal other than humans, has begun to form.
  • The baby’s skeleton is in place.
  • Ear and respiratory systems are forming.
  • Reflex responses are present.
  • The baby is beginning to move.
9 Weeks || First Trimester

9 Weeks || First Trimester

  • Brain waves have been detectable for two weeks.
  • Every organ and 99% of muscles are present.
  • The liver is making blood cells.
  • The kidneys are functioning.
  • The stomach is producing digestive juices.
  • Insulin can be found in the pancreas.
  • The baby can suck his thumb and bend his fingers around an object.
  • The baby is sensitive to physical touch and pain.
12 Weeks || First Trimester

12 Weeks || First Trimester

  • The baby can make facial expressions, including smiling, frowning, squinting, and furrowing his brow.
  • The baby’s fingerprints are visible.
  • The baby is breathing steadily.
  • The baby’s fingernails and toenails are fully formed.
  • The baby’s taste buds are working.
  • The baby can swallow.
  • The baby can cry and kick.
13+ Weeks || Second Trimester

13+ Weeks || Second Trimester

  • The baby is fully capable of feeling pain.
  • The baby’s vocal chords are present.
  • The baby can hear. Loud music will cause him to cover his ears.
  • The baby’s sex can be determined.
  • The baby is swimming and turning somersaults, and his mom will start to feel movement.
  • Rapid Eye Movement (REM) indicative of dreaming can be recorded.
  • Babies are typically fully viable by the end of the second trimester, if not earlier.
33+ Weeks || Third Trimester

33+ Weeks || Third Trimester

  • The baby recognizes his mom’s voice.
  • The baby is gaining about an ounce of weight a day.
  • 41 of the 45 total generations of cell replication that will take place by mature adulthood have already taken place. In developmental terms, as measured by cell replication, 90% of the growth we do in our lives happens in utero.
40 Weeks || Full Term

40 Weeks || Full Term

  • The average newborn weighs 7 pounds and measures 20 inches.
  • His mom’s voice is the baby’s favorite sound.
  • White noise will calm the baby because it reminds him of the rhythmic noises he heard in utero.
  • The baby has more brain cells than an adult.
  • Human babies are the only species that smile at their parents.

Understanding Abortion During These Stages

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