Watch This Incredible Animation of a Baby Growing Inside the Belly You Wont Believe What Happens Next

Once the preborn baby starts moving, he doesn’t keep still! When researchers quantified fetal movements, they found that the fetus does not stay still for more than 13 minutes at a time.

By eleven weeks, the nerve receptors inside the fetal skin can sense light touch. If something lightly tickles the sole of the fetus’s foot, the fetus will bend his knee to withdraw his foot, and may curl his toes.

This image shows a real living embryo 9 weeks following fertilization (or 11 weeks gestation). The picture was safely taken while he was still in the uterus using fetoscopy. At this point, he rarely stays still. (Image credit: The Center for Bioethical Reform)

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Prenatal development is continuous. There is no clear feature distinguishing an embryo from a fetus. Historically, if bone marrow had started replacing cartilage within the leg bone called the humerus, then the embryo was considered a fetus.

Now, at 11 weeks, the embryo is called a fetus. A fetus has developed every major body organ, though they may not be in their final location, and they may not be fully functional yet.

The amniotic sac is a thin but tough pair of transparent membranes, which hold the developing baby until shortly before birth. The inner membrane, called the amnion, contains the amniotic fluid and the fetus. The amnion does not have any blood vessels of its own. The other membrane, called the chorion, keeps the amnion safe and is part of the placenta. The chorion contains fetal blood vessels.

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Before the fetal skin thickens, water and nutrients from the amniotic fluid actually pass through the skin to the fetus. Fluids from the fetal digestive tract and respiratory system enter the amniotic fluid as well. Starting around 13 weeks, the fetus starts urinating into the amniotic fluid, too. Given that the amniotic fluid penetrates the developing fetus at many locations, it must be kept clean. In fact, the water content of the amniotic fluid changes every three hours! Large amounts of water pass through the amniochorionic membrane at the placenta to keep amniotic fluid in balance with fetal circulation.

The volume of amniotic fluid increases slowly, reaching around 30 milliliters around 12 weeks, 350 milliliters around 22 weeks and up to 1 liter by the time the baby is born.

This baby and his placenta are surrounded by the amniotic sac, a fluid-filled sac designed to protect and nourish the growing child. (Image Credit: Priests for Life)

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The baby’s sex is determined at conception by the combination of X and Y sex chromosomes that the baby receives from the egg and the sperm. All eggs contribute an X chromosome, while sperm contribute either an X or a Y chromosome. Embryos with XY chromosomes develop male sex organs, while those with XX chromosomes develop female sex organs. Therefore, the father’s sperm determines a baby’s sex.

For the first few weeks of development, all embryos have both male and female internal reproductive structures, and their external genitalia remains similar for until about 10 weeks gestation. Between 8 and 12 weeks, the baby’s internal sex organs start to develop. The Y chromosome signals for male hormone production around 8 weeks These hormones act on the reproductive structures, turning them male. Although rare, there are various genetic and developmental disorders that can occur during sex development.  By 12 weeks, the external genitalia start to lengthen in males to form the penis, or remain short in females to form the clitoris and labia. By 14 weeks, doctors can usually determine if the baby is a boy or a girl using ultrasound.

Medical art animation was used to provide a schematic representation of fetal development, with some features, including timing, not to scale. The animation was chosen as an ethically uncompromised guide to fetal development. There are many real human images at each developmental age showing the most accurate fetal forms throughout development. A concerted effort was made to use images and material in which the human embryo or fetus did not undergo any known harm.The world is a confusing place right now. We believe that faithful proclamation of the gospel is what our hostile and disoriented world needs. Do you believe that too? Help TGC bring biblical wisdom to the confusing issues across the world by making a gift to our international work.

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The organization Live Action has put together a beautiful and medically accurate animation of life within the womb, from fertilization to birth. Go to babyolivia.liveaction.org for more resources.

By week three, Olivia’s heartbeat can be detected, her brain and gastrointestinal tract have begun to form, and the cells for her nerves, blood, and kidney have appeared. Her mother may know of Olivia’s existence through a pregnancy test at this stage.

At just four weeks, the buds of Olivia’s arms are and legs are visibly forming, and the right and left hemispheres of her brain are beginning to take shape.

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At weeks five and six, Olivia moves spontaneously and reflexively, her bones begin to develop, and her brain activity can be recorded.

Olivia can bring her hands together, she can hiccup, she has had over one million heartbeats, and her ovaries and the cells needed for future generations of children are present.

Olivia’s stage of human development now classifies her as a fetus. She can suck her thumb, swallow, grasp an object, touch her face, sigh, and stretch out in her mother’s womb.

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Olivia can play in the womb and her taste buds have matured to discrete tastebuds. By week 14, Olivia’s lips and nose are fully formed, she makes complex facial expressions, and her mother can finally feel her movements.

The neuron multiplication of Olivia’s brain is mostly complete and she is sensitive to touch. At this stage of development, ultrasounds can detect speaking movements in her voice box and her teeth are beginning to grow.

By 19 weeks old, her heart has beaten over 20 million times. At 21 weeks old, Olivia could survive outside of the womb with medical assistance.

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Olivia can recognize her parents’ voices and will react to sudden loud noises. Her eyes respond to light, and she also has a functioning sense of smell.

Olivia exhibits breathing movements, she can produce tears, her umbilical cord is typically twenty to twenty-four inches long, and she will weigh between six and eight pounds at birth.

Justin Taylor is executive vice president for book publishing and publisher for books at Crossway. He blogs at Between Two Worlds and Evangelical History. You can follow him on Twitter.In gestational week 12, the preborn child’s fingernails start to grow.  Just like an adult’s, the fetus’s nails grow out slowly from the nail bed. The fingernails won’t reach the fingertips until approximately 32 weeks.

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This image shows the embryo alive in the uterus 10 weeks following fertilization (or 12 weeks gestation), recorded using fetoscopy. The nerve receptors on the face, hands, and feet of this fetus respond to light touch. Notice how long her arms and legs have grown from the previous week. (Image credit: The Center for Bioethical Reform)

The first recorded eye movements come from week 12. When something touches the upper eyelid, the eyes roll downward and the muscles around the eye ‘squint’.

  Furthermore, if researchers touch the palm of the fetus’s hand at this age, she curls her fingers in towards the object, but not her thumb. The fetus does not include her thumb in grasping an object until about 15 weeks.

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Humans have two sets of teeth because a child’s jaw is too small to fit the adult teeth. Plus, the second set of teeth lets accidents and poor dental hygiene have fewer long term consequences.

Teeth start as buds in week 9. They form from the interaction of cells near the early neural tube, called neural crest cells, and the external tissue layer, called ectoderm. Basically, the enamel coating on teeth comes from the ectoderm while the inner structure of a tooth, including the roots and dental pulp, comes from the neural crest cells.

Around 11 weeks, the bud of a second tooth starts to form behind the first tooth. The second tooth will slowly develop into the permanent adult tooth. The first tooth to form becomes the baby tooth.

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Next, the jaw bone forms around the baby tooth and permanent tooth, holding them in place. Then the tooth grows by adding layers of dentin inside the tooth and enamel outside the tooth. Finally, the baby teeth start to poke out of the gum, starting roughly six months after birth.

Most children have their full set of 20 baby teeth by age 2. Permanent teeth form inside the jaw bone through early childhood. When children shed their baby teeth, only the crown and the uppermost part of the root fall out. The permanent teeth use the same artery and bone socket that the baby teeth used.

A frontal view of the jawbone and skull shows how the permanent teeth are developing underneath the baby teeth. This skull comes from a 6 1/2 year old. (Image Credit: Henry Gray, 1918, Public Domain)

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Medical art animation was used to provide a schematic representation of fetal development, with some features, including