Fetal Development

  • week 1 Last Period

    week 1 Last Period
    fist day of menstrual bleeding is the official beginning of a pregnancy,until the baby is born and is where the 40 week process of development begins. It also will be the last menstrual cycle a woman will go through for a period of 40 weeks, or the babies birth.
  • Period: to

    fetal development

  • week 2 fertilization

    week 2 fertilization
    this is when the sperm cell successfully penetrates the egg in the fallopian tube, and the egg does not allow any more sperm to enter. Then the cells start dividing really quickly and will keep doing so until the fetus develops all anatomical structures.
    Facts: in order to develop twins the egg has to split into two
  • week 3 Life

    week 3 Life
    The egg will continue to divide and travel down the fallopian tube where it will eventually end up in the uterus. The sex of the child is already embedded in the DNA of the sperm,so when the egg is fertalized it already carries all of its genetic code.
  • week 4 Implantation

    week 4 Implantation
    implantation of the egg into the uterine wall happens rougly around three days after it has benn introduced into the uterus.called a Blastocyst it has 50 to 60 cells already, whereverthe egg has implanted itself is where the placentawill begin to form.
  • week 5 Begginning of Embryonic stage

    week 5 Begginning of Embryonic stage
    cells of the ovum start making the amniotic sac, and placenta. other cells will begin to begin forming the embryo itself. embryo wil double in size by the end of the week. The embryo grows to 5mm
    Fact: nerve and spinal chord begin early stages of development.
  • week 6 Heartbeat

    week 6 Heartbeat
    a tube shaped heart and blood vessels begin to form, a heartbeat can be detected from the embryo at this stage.The embryo begins to develop eye pits, the brain beegins development and five part separation, and the cells for what will be the limbs begin their positioning. Embryo has reached the size of 8 mm
  • week 7 Limbs

    week 7 Limbs
    By now the embryo's major organs have started to take shape, as well as eyes and vocal chords and spinal chord. the embryo begins to develop its arms and legs.
    Fact: folic acid in the diet helps prevent neural tube defects in the embryo, the embryo has reached a size of 13 mm
  • week 8 Movin' and Groovin'

    week 8 Movin' and Groovin'
    the baby begins to grow muscle tissue and the pituitary gland becomes present in the brain, the eyes begin to take shape and its mouth and nostrils begin to develop. Feet and hand nubs begin to come apparent on the embryo, teeth start growing in under the gums.
    Fact: baby begins to move but the mother cannot feel its movement. The embryo has grown to 18 mm or three fourths of an inch
  • week 9 fingers and toes

    week 9 fingers and toes
    by this time cartilage and bone in the embryo are being made, the larynx, anus, lips, nose and eyelids are developed. the embryo can move is wrists and knees by this point, and the heart has finished major development, The embryo measures around 1.2 inches.
  • week 10 Fetus

    week 10 Fetus
    by this time the fetus' muscles have almost finished formation, the neck, ears and nose are developed. the fetus has fingerprints, nipples, and hair follicles begin to grow, all of its organs and muscles are formed and functional.
    Fact: the fetus is about the same size as a strawberry and its feet are 2 mm long
  • week 11 Neurons

    week 11 Neurons
    at this point in time the cartilage if the fetus will begin calcifying to form bone, teeth form and the fetus can move its tongue. Most importantly the fetus is developing around 250,000 nerve cells in a minute. genitals are starting to form but you still cannot tell the sex of the fetus, and the baby has reached 1.5 inches in size.
  • week 12 Nails

    week 12 Nails
    the fetus finishes developing its facial profial and finishes developing its vocal chords. the fetus' brain is fuly formed and it feels pain, its pancreas will begin making insulin and the fetus will such on its fingers.
    Fact: the fetus will cry silently occasionally in its mothers womb, the fetus has reached 2.5 inches and weighs 0.7 ounces
  • week 13 Baby Back Ribs

    week 13 Baby Back Ribs
    the fetus' ribs will begin development and bones will start replacing the cartilage, the fetus can produce its own insulin to help regulate blood sugar. Measurement of the fetus' movements are possible and you can almost guess the sex of the fetus just by looking at an ultrasound. The fetus has reached 3 inches in size and weights roughly around 1 ounce
  • week 14 Hormones

    week 14 Hormones
    The fetus' facial features are more pronounced, eyes move closer inward, nose is sticking out more, and it's ears are more developed. The fetus will start urinating into the surrounding amniotic fluid because of the kidneys development. The fetus is 3.5 inches long and weights 1.5 ounces, ovaries start moving into place and prostate gland begin to develop.
    Fact: the babies body is covered in hair to protect its delicate skin from water
  • Week 15 Bones and Muscles

    Week 15  Bones and Muscles
    Muscle and bone growth are progressing, babies skin is still really thin and their fingernails and toenails are seen. The fetus' ears are almost where they are supposed robe because three bones around the ear are starting to harden. The baby measures four inches at this stage and weighs 2.5 ounces.
    Fact: baby can taste all three food the mom consumes now.
  • Week 16 Facial Expressions

    Week 16 Facial Expressions
    Fat starts to form under the fetus' skin, the muscles on the face have had more time to develop and the baby can show facial expressions like frowning. The fetus has learned how to breathe and inhales some amniotic fluid which helps strengthen the lungs. The fetus has grown to 5 inches and weighs around 3.5 ounces
    Fact: fetus can hear voices and begins to sleep and dream.
  • Week 17 Accumulation of Fat

    Week 17  Accumulation of Fat
    The fetus' eyes are facing forwards and it is beginning to store more fat, the baby will swallow the amniotic fluid. Waste starts to buildup in the fetus' digestive tract and it is named meconium made up of dead cells digestive secretions and some amniotic fluid. The babies umbilical chord is becoming larger and stronger and during this week the baby measures around 5 inches and weighs 5 ounces.
    Fact: The baby can detect light through its retinas on the eyes.
  • Week 18 Hearing

    Week 18 Hearing
    Alveoli start to form in the fetus' lungs, and vernix will start to grow on the babies skin to help protect it from all the harshness of the water on the babies skin. The baby will cry in the womb but will not be heard because of the lack of oxygen, the fetus can hear sounds like a stomach rumbling or it could even get startled by loud noises. The baby measures around 6 inches and weighs 7 ounces around this time .
    Fact: the baby can have a favorite sleeping position.
  • Week 19 Boy or Girl?

    Week 19 Boy or Girl?
    If the vagina uterus Fallopian tubes and ovaries start to form you have a girl, if testicles and penis can be seen on ultrasound then it's a boy. The babies scalp hair will start to grow around this time, the baby now measures around 6.5 inches and weighs around 9 ounces.
    Fact: the ultrasound tech can make mistakes and accidentally determine the wrong sex.
  • Week 20 almost done cookin'

    Week 20 almost done cookin'
    At this time the babies skin will start getting thicker, their hair growth and nail growth keep increasing as well. The baby can recognize its mothers voice, you can hear the babies heartbeat with a stethoscope; during this time the baby is around 7 inches long and weighs around 11 ounces.
    Fact: the baby grows accustomEd to voices and music, all of which that can be used to soothe a baby after birth.
  • Week 21 Nourishment

    Week 21 Nourishment
    By this time the babies born marrow had started making its own blood cells, and the small intestine is starting to absorb sugars that it gets from the amniotic fluid. The babies head has grown to 2 inches and the doctors can come up with an estimated arrival date, within a weeks accuracy. The baby measures 10.5 inches and it weighs 12.7 ounces.
  • Week 22 Tastebud Development

    Week 22 Tastebud Development
    At this time the baby has a sleep schedule that it will follow, any movement or loud noises made by anyone or anything will wake up the baby. Tastebuds start to form on the babies tongue and its eyebrows and eyelids are fully developed. The baby measures 28 Cm long , and weighs a little over 450 grams.
    Fact: the baby is definitely bigger now, the pregnancy starts to become more obvious.
  • Week 23 Balance Sensory

    Week 23 Balance Sensory
    Fully developed inner ear lets the baby control its balance, and it can determine the direction in which it is facing. The pancreas has started to form which helps produce hormones. The baby weighs around 550 grams and measures around 28 Cm.
    Fact: the Babies begin to develop their skin tones This week of development.
  • Week 24 Breathing

    Week 24 Breathing
    The lungs are further developing and producing cells that have surfactant in order to prevent the lungs from collapsing . The baby is covered in a waxy substance to help make the birthing process a lot less painful. The babies eyelids start to be seen more, and they express emotions towards food, now the baby weighs around 1.3 pounds and measures at 12 inches.
    Fact: a baby born at this age might still be able to survive if it were born
  • Week 25 Exploration

    Week 25 Exploration
    At this time the babies genitals are fully developed and you can distinguish the sex of the child, feet, hands, ligaments, spinal rings, and joints are growing quickly. The baby will start touching its umbilical chord, and other structures of itself and the mother because it can feel sensation, The baby measures around 13.5 inches and weighs 1.5 pounds.
    Fact: Twins will start touching each other and familiarizing themselves with each other.
  • Week 26 end of second trimester

    Week 26 end of second trimester
    The baby is more responsive to touch, and the babies muscles become more coordinated and it starts moving around in the womb. The baby has the ability to suck it's thumb which strengthen the jaw muscles, at this time the baby is 14 inches long and weighs around 1.7 pounds.
    Fact: you can play with the baby by touching on your stomach
  • Week 27 Eyes

    Week 27 Eyes
    Brain still grows very quickly and the babies muscle will get toned and the baby will get fuller. The retinas behind babies' eyes are starting to develop so it can open its eyes, it can blink and open/ close its eyes. The baby now measures 14.5 inches and weighs around 2 pounds
    Fact: if you shine a flashlight to your belly the baby will turn away
  • Week 28 Voice Recognition

    Week 28 Voice Recognition
    The brain waves of the babies brain can detect weather a baby is dreaming, the babies eyes will start to change to the color of which they will be at birth. The baby will start recognizing familiar voices, especially the mothers and fathers, by this time the baby has grown to 14.8 inches and weighed around 2.2 pounds.
    Fact: babies milk teeth are fully developed under its gums
  • Week 29 forceful movements

    Week 29 forceful movements
    The babies head is growing bigger to help fit the ever growing brain in there, the baby can also move its eyes around and follow a light. Baby keeps moving side to side but does not nearly move as much as before because it is outgrowing the womb, by now the baby measures 15 inches and weighs 2.5 pounds.
    Fact: the baby will start to acquire taste and a preferred tastes palette, the baby can also kick enough to knock the wind out of you now.
  • Week 30 baby gets built

    Week 30 baby gets built
    The baby will begin storing iron, phosphorus, and calcium; it will start producing and maintaining some of its vital functions more independently. The baby can start to control its own body temperature and its fingers and toes have finished developing, the babies measurements are 16 inches and 3 pounds.
    Fact: boys testicles will descend into the groin at this stage.
  • Week 31 Detection of light

    Week 31 Detection of light
    The babies kinds and digestive system is finishing being developed, and the baby will start rapidly gaining weight. Mostly all the organs have finished development so they will just start maturing in the womb overtime, by now the baby measures 16.5 inches and weighs 3.5 pounds
    Fact: loud noises can scare the baby
  • Week 32 continuation of development

    Week 32 continuation of development
    The baby will sleep for most of the day now, and the baby will move less because of limited room to move, it will still move its head, hands, and feet but not as powerful as before. The testicles start descending into the scrotum for boys and the girls clitoris will become more obvious, the baby now measures 17 inches and weighs 4 pounds.
    Fact: counting kicks helps check on the babies' movements.
  • Week 33 bye bye baby fuzz

    Week 33 bye bye baby fuzz
    The lanugo fibers that protected the babies skin from the moisture of amniotic fluid is starting to disappear, and real hair has been developing in its place. The baby breathes in about a pint of amniotic fluid to excersize the lungs and pees out a pint as well, the baby measures 17.5 inches and weighs 4.4 pounds at this time.
    Fact: mom starts gaining at least a pound a week now
  • Week 34 Rapid Growth

    Week 34 Rapid Growth
    The fat starts growing on the babies arms and legs and plumping the baby up before birth. The baby will close its eyes when it's asleep and it will open them when it's awake, and it's fingernails have completely finished formation. The baby now measures around 18 inches and weighs 5.25 pounds.
    Fact: the babies head might have already turned downwards in the " birthing position".
  • Week 35 " float like a butterfly sting like a bee"

    Week 35 " float like a butterfly sting like a bee"
    The babies reflexes are coordinated and ready at this point, they can grab, touch, respond to light and sound, and they can turn their heads, the lungs are almost done developing as well. From now on the baby will gain a pound a week approximately, and he measures at 18.5 inches and weighs around 5.5 pounds.
    Fact: babies who are born this week have a 90% survival rate, but need incubation
  • Week 36 " you dropped a bomb on me baby"

    Week 36 " you dropped a bomb on me baby"
    The baby is almost mature, the liver and kidneys have produced some waste and all that needs to finish the last stages of development is the lungs. The baby will drop in the direction of the vagina at this time, the baby now measures 19 inches and weighs around six pounds.

    Fact: when the baby is in the dropped position it becomes harder to walk for the mother and she needs to visit the bathroom a few more times then usual.
  • Week 37 At term or New Years Nightmare?

    Week 37 At term or New Years Nightmare?
    The walls of the uterus and abdomen are thinner now, and more light is let into the womb, which the baby will start to do some activity cycles. Mucus or discharge from the vagina might increase and the mother can go into labor anytime, the baby grew to approximately 19.5 inches and weighs around 7 pounds.
    Fact: feet, hands, elbow, head or any other limb can probably be seen pressing against the mothers belly.
  • Week 38 Development has finished

    Week 38 Development has finished
    Development of the baby has finished, the main goal of the babies time in the womb now is just to gain weight, the baby will have a full head of hair now if genetically granted. The baby swallows all the vernix Caseosa and the lanugo, the baby will store all of the waste to produce meconium. The baby is now 20 inches long and weighs around 7.5 pounds.
    Fact: If the baby is stressed and releases the stool made of meconium into the amniotic fluid and the baby ingests, it can get pneumonia.
  • Week 39 "get out of me"

    Week 39 "get out of me"
    The baby is just chillin' in there waiting for its time to arrive, it is gaining more weight and absorbing more nutrition. The space in the uterus is getting extremely small for the child and they recommend that the mother tracks movement. The baby is now 20 inches long and weighs around 7.5 pounds.
    Fact: eye color by race/ ethnicity is all determined by different periods of time after the child's birth.
  • Week 40 D-Day

    Week 40 D-Day
    The baby will tuck its legs to its chest and its knees will be touching its nose, mom will start having contractions and her placenta will rupture. It's go time. Once the baby is born and it breathes air for the first time, the heart will send the blood to the lungs in order to be aerated. The baby is born around 20 inches weighing approximately 7.5 pounds
    Fact: the babies' skull is soft in order for it to have easy passage through the vagina at birth