Prenatal Development Timeline

By erodriguez21
  • 1 CE

    Conception

    Conception
    The sperm joins with the egg (fertilization) by 5-6 days it has traveled through the falopian tubes, by days 10-12 it has become an embryo.
  • Period: 1 CE to 3

    The First Trimester

    The first trimester is from conception to the end of 12 weeks
  • 2

    Development at 4 Weeks

    Development at 4 Weeks
    the embryo is developing and froming things like the face and neck, the heart and vessels are continuing to develop and the lungs and stomach will start to develop. If you take a pregnancy test it will show up positive now.
  • 3

    Development at 12 Weeks

    Development at 12 Weeks
    The fetus is about 2 inches and starts to make its own movements, now you might be able to hear the heartbeat with special instruments. At the end of 12 weeks the first trimester is over.
  • 4

    Development at 16 Weeks

    Development at 16 Weeks
    The fetus is now 4.3-4.6 inches in length and about 3.5 ounces, the fetus can now blink and the heart and blood vessles are completely formed. The fetus now have fingerprints.
  • Period: 4 to 6

    The Second Trimester

    The second trimester lasts from week 13 to the end of week 26.
  • 5

    Development at 20 Weeks

    Development at 20 Weeks
    At 20 weeks your uterus should be at about your belly button, the fetus can suck its thumb, yawn, and make faces, the fetus will start to move. Usually at 20 weeks you will get your first ultrasound and be able to tell if it is a boy or girl.
  • 6

    Development at 24 Weeks

    Development at 24 Weeks
    The fetus is now 1.4 pounds and responds to light or sound by moving and quickening their pulse, the inner ear is now fully developed and the fetus might be able to tell when it is upside down in the womb.
  • 7

    Development at 28 Weeks

    Development at 28 Weeks
    The fetus weighs about 2 pounds and changes position often, if you were to give birth prematurley the baby would likely survive.
  • Period: 7 to 9

    The Third Trimester

    The third trimester lasts from week 27 to birth
  • 8

    Development at 36 Weeks

    Development at 36 Weeks
    The fetus is around 18.5 inches and 6 pounds, the brain has been developing rapidly and the lungs are almost completely developed. The fetus is positioned down close to the pelvis.
  • 9

    Birth

    Birth
    Your due date marks the end of the 40th week, the due date is calculated using the first day of your last period. Pregnancy can last anywhere from 38-42 weeks.