Baby Growth During Pregnancy

week by week baby development during pregnancy

Follow your baby’s advancement from a tiny mass of cells through to a fully month by month, week by week established baby.

Week by Week Baby Development During Pregnancy

2 weeks: Fertilization

Fallopian tube: A sperm has to swim all the way from your vaginal area up through your cervix and uterus and into the fallopian tube to feed the egg.

Ovary: One of your eggs has broken out of its roots in the ovary and been swept into the fallopian tube.

Ovum: Once a sperm burrows through the external membrane to permeate the ovum, or egg, their hereditary material integrates to form a brand-new cell that soon begins quickly dividing.

Sperm: All it takes is one sperm out of about 250 million in the typical ejaculation to fertilize the egg.

3 weeks: Implantation

Amniotic sac: Amniotic fluid is starting to gather in this cavity, which will quickly envelop the embryo and become the anmniotic sac.

Blastocyst: Your baby-in-the-making is a small ball of numerous hundred quickly multiplying cells. The ball is called a blastocyst.

Embryo: The cells that will become the embryo are starting to organize themselves in 2 round and flat layers.

Placental cells: These cells will quickly form the placenta. Right now they’re producing hCG, the hormonal agent that turns a pregnancy test favorable.

Uterine lining: The blastocyst has actually started burrowing into the blood-rich uterine lining.

Vaginal area: You might observe a little finding by the end of this week, possibly caused by the blastocyst burrowing into the blood-rich uterine lining.

Yolk sac: This cavity will soon be the yolk sac, which produces your baby’s red blood cells and provides nutrients until the placenta is ready to take over.

week by week baby development photo
Photo by week by week baby development

How baby growth during first month of pregnancy

4 weeks

Amniotic sac: By next week, this cavity will cover the embryo and continue to house your baby throughout your pregnancy.

Embryo: All of your baby’s organs and body parts will establish from the two layers of cells that now make up the embryo: the epiblast and the hypoblast.

Primitive placenta: The cells of this primitive placenta are tunneling into your uterine lining, producing areas for blood to stream into and bring nutrients and oxygen to your baby later on today.

Yolk sac: The yolk sac produces your baby’s red cell and delivers nutrients till the placenta is ready to take over this task.

5 weeks

Bladder: You might soon start to see a more frequent urge to pee. Your blood volume is increasing, producing a great deal of additional fluid that winds up in your bladder.

Embryo: About the size of a sesame seed, the embryo is made of 3 layers of cells that are folded over on each other.

Neural tube: At the fold of the leading layer of the embryo is the neural tube, which will become the baby’s brain, spine, nerves, and backbone.

Primitive placenta: The tiny capillary (“villi”) that make up the primitive placenta provide nutrition and oxygen to the embryo.

Yolk sac: The yolk sac will quickly yield its job delivering nutrients to the establishing placenta.

Amniotic sac: The amniotic sac now houses the embryo, which drifts in a growing sea of amniotic fluid.

6 weeks

Arm bud: Your baby currently has actually small hands formed like paddles, with thick webbing between the establishing fingers. She’ll start moving her arms later on this week.

Heart bulge: Your baby’s heart is beating almost twice as quickly as yours and starting to divide into right and left chambers.

Leg bud: Your baby currently has tiny feet formed like paddles, with thick webbing between the developing toes. She’ll begin moving her legs later on this week.

Lower jaw: Inside your baby’s small mouth, the tongue and vocal cords are just starting to form.

7 weeks

Bladder: You might soon begin to see a more regular urge to pee. The amount of blood in your body is increasing, developing a lot of additional fluid that ends up in your bladder.

Eyelid: Eyelid folds now partially cover your baby’s eyes.

Tailbone: What appears like a tail is really an extension of your baby’s tailbone. It will vanish in the next few weeks

Umbilical cord: A loop of your baby’s growing intestines is bulging into the umbilical cord.

How baby growth during second month of pregnancy

8 weeks

Brain: The nerve cells in your baby’s brain are branching off to connect with one another, forming primitive neural paths.

Eyelid: Translucent eyelids now almost cover your baby’s eyes.

Hand: Your baby’s hands are bent at the wrist and meet over the heart. The fingers are still slightly webbed but growing longer.

Knee joint: Your baby now has knees, and her feet might be long enough to fulfill in front of her body.

9 weeks

Chorionic villi: If you have chorionic villus tasting (CVS) in the next few weeks, the doctor will draw cells from the small forecasts in the placenta called chorionic villi.

Earlobe: Your baby now has earlobes.

Eyelid: Your baby’s eyelids are now merged shut and won’t open till 27 weeks

Fingers: The suggestions of your baby’s fingers are somewhat enlarged where his “touch pads” are establishing.

Shoulder: Your baby can now move his limbs; all the significant joints are working, consisting of the shoulders, elbows, wrists, knees, and ankles.

10 weeks

Brain: Your baby’s forehead bulges with her developing brain and sits high on her head.

Fingers: Your baby’s fingers are now completely separated and tiny fingernails are starting to grow in.

Uterus: Your uterus has doubled by now, from the size of a pear prior to you got pregnant to the size of a grapefruit.

Yolk sac: Your baby’s liver is now making blood cells; the yolk sac is no longer needed and starts to disappear.

11 weeks

Bone: Your baby’s bones are beginning to solidify and small tooth buds are starting to appear under his gums.

Hand: Your baby may soon be able to open and close his fists.

Skin: Your baby’s skin is still transparent, allowing numerous capillary to show through.

12 weeks

Ear: Your baby’s ears are closer to their final positions on the sides of her head.

Eyelid: Your baby’s eyelids are less transparent now and her eyes have actually moved better together.

Umbilical cord: Your baby’s intestinal tracts, which have actually grown so quickly that they protrude into the umbilical cord, will begin to return into her abdominal cavity now.

Uterus: The top of your uterus (fundus) is starting to rise above your pelvic bones now; you may have discovered that your waist is thickening.

How baby growth during third month of pregnancy

13 weeks

Amniotic sac with fluid: Your baby’s urinary tract is now working; he’s beginning to urinate out the amniotic fluid he’s been swallowing.

Fingers: Your baby now has his own special set of finger prints.

Head: Your baby’s head is now more proportional; it’s about a third the size of his body.

14 weeks

Arm: Your baby’s arms have actually extended; by the end of this week, they’ll be in percentage with the rest of her body.

Face: Thanks to brain impulses, your baby’s facial muscles are getting an exercise as she squints, frowns, and grimaces.

Lanugo: Your baby is beginning to develop an ultra-fine downy covering of hair all over her body; this is called lanugo.

Uterus: The top of your uterus has increased above your pelvic bone and may be pushing out your tummy a bit.

15 weeks

Amniotic sac with fluid: Your baby is hectic inhaling and breathing out amniotic fluid, which will help the air sacs in his lungs develop.

Eyelid: Although your baby’s eyelids are merged shut, he can pick up light. If you shine a flashlight at your stomach, he’s likely to move far from the beam.

Leg: Your baby’s legs are growing longer than his arms now, and he can move all his joints and limbs.

16 weeks

Capillary: Your baby’s circulatory system is now working; her heart is pumping about 25 quarts of blood a day.

Head: Your baby’s head is more set up now. Her scalp pattern is beginning to develop although her hair hasn’t begun growing in yet.

Toe: Your baby has started growing toenails.

How baby growth during fourth month of pregnancy

17 weeks

Ear: Your baby’s sense of hearing is establishing.

Elbow joint: Your baby can move all his joints. His skeleton is turning from rubbery cartilage into hardened bone.

Umbilical cord: Your baby’s umbilical cord, his lifeline to the placenta, is growing stronger and thicker.

18 weeks

Blood vessels: Your baby’s capillary are visible through her skin.

Ear: Your baby’s ears are now in position and stand apart from her head.

Information verified by the team.

Leg: Your baby is hectic flexing her arms and legs– movements that you’ll soon start to observe if you have not currently.

Placenta: You may have an ultrasound in the next couple of weeks to see how your baby’s growing, screen for birth defects, and inspect the position of the placenta.

19 weeks

Brain: This is a crucial time for sensory development. Your baby’s brain is designating specialized areas for smell, taste, hearing, vision, and touch.

Leg: Your baby’s arms and legs are now in the right percentages to each other and to the rest of his body.

Scalp: Hair is sprouting on your baby’s scalp.

Uterus: You might be feeling some achiness in your lower abdominal area brought on by the stretching of the ligaments that support your growing uterus.

20 weeks

Bowel: Meconium is collecting in your baby’s bowel. This sticky black substance comprised of discarded cells, digestive secretions, and swallowed amniotic fluid will appear in her first filthy diaper.

Skin: Your baby’s body is now coated with an oily white substance, the vernix caseosa, that secures her skin throughout its long submersion in amniotic fluid.

Uterus: The top of your uterus (fundus) is now at the level of your belly button.

How baby growth during fifth month of pregnancy

21 weeks

Eyelid: Your baby’s eyelids and eyebrows are now fully established.

Uterus: You might establish varicose veins in your legs, in part since your growing uterus puts pressure on the inferior vena cava, the large vein that returns blood from the legs to the heart.

22 weeks

Eyes: Your baby’s eyelids are still merged shut. Beneath them, the eyes are developed however the irises (the colored part of the eye) still lack pigment.

Lips: Your baby’s lips are ending up being more distinct and tooth buds are developing underneath her gum line.

Skin: Your baby’s skin will look old and wrinkly until she acquires sufficient weight to fill it out.

Uterus: You might establish stretch marks on your belly as your abdomen broadens to accommodate your growing uterus. Also, your belly button may soon “bulge” if it hasn’t currently.

23 weeks

Ear: Loud sounds that your baby hears often in utero– such as the dog barking– most likely will not bother him after birth.

Skin: Your baby’s skin is red and old and wrinkly. This holds true for all infants, no matter what color their skin will be after birth.

Uterus: Your growing uterus puts pressure on the veins that return blood from the lower half of your body. This can cause swelling (called edema) in your ankles and feet.

24 weeks

Lungs: Your baby’s lungs are establishing “branches” of the breathing “tree” as well as cells that will produce surfactant, a substance that assists air sacs in the lungs inflate quickly.

Skin: Your skin may be feeling a bit itchy and dry as it extends. Keeping it well hydrated may assist.

Palate: Your baby’s palate are developing now.

Uterus: The top of your uterus is now an inch approximately above your belly button, making it about the size of a soccer ball.

How baby growth during sixth month of pregnancy

25 weeks

Fat: Your baby is beginning to put on baby fat. As he does, his skin will begin to ravel and he’ll start to look more like a newborn.

Hair: Your baby’s hair now has identifiable color and structure, although both may alter after he’s born.

Uterus: Your growing uterus puts pressure on the veins that return blood to the heart, which is why you may feel woozy if you rest on your back for too long.

26 weeks

Back: Your back might be aching thanks to a moving center of gravity and pregnancy hormones loosening up your joints and ligaments.

Ear: The nerve paths in your baby’s ears are developing, so her response to sounds is growing more consistent.

Genitals: If you’re having a child, his testicles are beginning to come down into his scrotum– a trip that will take two to three months.

27 weeks

Eye: Your baby can now open and close his eyes, and he rests and wakes at routine intervals.

Mouth: Your baby may draw his fingers. You might likewise feel him getting the hiccups from time to time.

Uterus: As your uterus grows, it puts pressure on the capillary that return blood from your legs. As an outcome, your leg muscles might constrain up from time to time.

28 weeks

Eye: Your baby now has eyelashes and will turn her go to a continuous intense light from outside.

Fat: Layers of fat are starting to form as your baby gets ready for life outside the womb.

Uterus: You should be able to feel your baby’s movements rather routinely now.

29 weeks

Rectum: It’s typical to get hemorrhoids throughout pregnancy. These swollen capillary in your rectal area ought to clear up a couple of weeks after delivery.

Bone: Your baby’s skeleton– which is now solidifying– gets about 200 milligrams of calcium a day.

Head: Your baby’s head is growing bigger to accommodate his brain, which is hectic developing billions of nerve cells.

Uterus: You may feel lightheaded if you rest on your back now. That’s since your growing uterus puts pressure on the veins that return blood from your lower half to your heart.

How baby growth during seventh month of pregnancy

30 weeks

Amniotic fluid: A pint and a half of amniotic fluid surrounds your baby. That volume will come to a head over the next couple of weeks then decrease as your baby grows and submits your uterus.

Eye: Your baby has the ability to compare light and dark. At birth, her vision will be about 20/400, which implies she can just construct objects a couple of inches from her face.

Uterus: As your uterus grows, your balance will be off and you might feel awkward.

31 weeks

Fat: Your baby is collecting a layer of fat under his skin. As an outcome, his legs, arms, and upper body are filling out.

Uterus: You may have discovered the muscles in your uterus tightening up from time to time. These are Braxton Hicks contractions and it’s common to feel them in the second half of your pregnancy.

32 weeks

Hair: Some babies have a complete head of hair by this point; others have just peach fuzz.

Toenail: Your baby’s fingernails and toenails have actually now grown in.

Uterus: With your uterus rising near your diaphragm and putting pressure on your abdomen, you might be handling heartburn more often or feeling a little brief of breath.

33 weeks

Skin: Your baby’s skin is ending up being less red and old and wrinkly.

Skull: Your baby’s skull is fairly pliable and not entirely signed up with. This will help him relieve of your relatively slim birth canal.

How baby growth during eighth month of pregnancy

34 weeks

Fat: Your baby’s layers of fat are filling out. She’ll require them to control her body temperature once she’s born.

Lungs: Your baby’s lungs are well developed now. About 99 percent of children born at this stage can survive outside the womb, and many have no major long-term problems.

35 weeks

Amniotic fluid: The quantity of amniotic fluid surrounding your baby has come to a head and will begin to reduce now.

Fat: Your baby will spend the next few weeks putting on weight at the rate of about an ounce a day.

Uterus: Your uterus has broadened to about 15 times its initial volume and is poking up under your ribs.

36 weeks

Head: Your baby is most likely in a head-down position by now, which is optimum for a smooth delivery, and the head may be dropping lower into your pelvis.

Uterus: Your Braxton Hicks contractions may be a bit more frequent now.

37 weeks

Hair: Your baby might have a full head of hair now, with locks up to 1 1/2 inches long. Of course, some infants sport only peach fuzz at birth.

Skin: Your baby is shedding the majority of her downy body hair in addition to some of the vernix caseosa, the velvety substance that safeguards her skin

Uterus: You might be having more Braxton Hicks contractions now, and they might last longer and be more uncomfortable.

Vaginal area: You may observe an increase in mucus discharge from your vaginal area. If you see some “bloody program” (mucus tinged with a tiny bit of blood), labor is probably right around the corner.

38 weeks

Eyes: If your baby is born with brown eyes, they’ll likely remain brown. If she’s born with dark gray or blue eyes, they may stay that color or turn brown, green, or hazel throughout her first year.

Hand: Your baby has a firm grasp now.

How baby growth during ninth month of pregnancy

39 weeks

Amniotic sac: When someone states “my water broke,” that means the amniotic sac has ruptured and amniotic fluid is leaking or gushing out. In a lot of pregnancies, this doesn’t happen until labor has begun.

Fat: Your baby is still placing on layers of fat to assist manage his body temperature level after birth.

Skin: Your baby’s outer skin cells are sloughing off as brand-new skin forms underneath.

40 weeks

Hair: Your baby’s hair and nails continue to get longer with every passing day.

Skull: The skull bones are separated so that they can compress enough to fit through the birth canal throughout labor. Your baby will have soft spots on her head for the first year or more after birth.

41 weeks

Amniotic sac: There’s less amniotic fluid around your baby now.

Cervix: Your practitioner may inspect your cervix to see how soft it is, how effaced (thinned out) it is, and how dilated (open) it is. This is necessary info if you have to be caused.

Skin: By now, your baby’s skin has actually most likely begun to peel a bit as a result of his long bath in the amniotic fluid.


Reyus Mammadli

As a healthy lifestyle advisor I try to guide individuals in becoming more aware of living well and healthy through a series of proactive and preventive measures, disease prevention steps, recovery after illness or medical procedures.

Education: Bachelor Degree of Medical Equipment and Electronics.

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