Picture of Baby Inside Womb at 1 Month

We are sure you are curious about how your pregnancy will progress, and how your baby will develop week to week over the next few months.

Your Baby's Growth: Conception to Birth

Congratulations on becoming pregnant! We are certain you are curious well-nigh how your pregnancy will progress, and how your babe volition develop week to week over the next few months. In this slideshow nosotros will look inside the womb to see how a babe develops through the first, 2nd, and third trimesters.

Step one of conception is when the sperm penetrates the egg to complete the genetic make-up of a human fetus.

Conception

Stride i of conception is when the sperm penetrates the egg to consummate the genetic brand-up of a human fetus. At this moment (conception), the sexual practice and genetic make-up of the fetus begins. About three days later, the fertilized egg jail cell divides chop-chop and and then passes through the Fallopian tube into the uterus, where it attaches to the uterine wall. The attachment site provides nourishment to the rapidly developing fetus and becomes the placenta.

After 4 weeks, the basic structures of the embryo have begun to develop into separate areas that will form the head, chest, abdomen, and the organs contained within them.

Baby'south Evolution at 4 Weeks

Subsequently 4 weeks, the basic structures of the embryo take begun to develop into separate areas that will form the head, chest, belly, and the organs contained inside them. Small buds on the surface will become arms and legs. A home pregnancy test should be positive at this stage of development (most tests claim positive results i calendar week later on a missed flow).

At 8 weeks, the fetus is about a half-inch long (1.1cm).

Babe's Development at 8 Weeks

At 8 weeks, the fetus is about a half-inch long (1.1cm). Facial features such equally developing ears, eyelids, and nose tip are present. The limb buds are now conspicuously arms and legs, while the fingers and toes are however developing.

At 12 weeks, the fetus has grown to about 2 inches (4.4cm) in length and may begin to move by itself.

Baby's Development at 12 Weeks

At 12 weeks, the fetus has grown to about two inches (4.4cm) in length and may begin to movement past itself. The fingers and toes are discernible, and the fetal heartbeat may be aural by Doppler ultrasound. The developing sex organs may be identified by ultrasound techniques.

At 16 weeks, the fetus is about 4 and one-half inches long and resembles an infant.

Baby'south Development at sixteen Weeks

At 16 weeks, the fetus is about 4 and half inches long and resembles an babe; the optics blink, the heartbeat is easier to locate, facial features (olfactory organ, mouth, mentum and ears) are distinct, and the fingers and toes are clearly developed; the skin on the fingers and toes even has distinct patterns (fingerprints!). Women should exist able to feel the uterus at about three inches (six.six cm) below the umbilicus; this is the outset of the "babe bump" (abdominal swelling due to an expanding uterus) in some women.

At 20 weeks, the developing fetus is about 6 inches long (13.2 cm) and may weigh about 10 ounces.

Baby'south Development at 20 Weeks

At 20 weeks, the developing fetus is about half dozen inches long (13.ii cm) and may counterbalance almost x ounces. The baby may begin to brand movements that the female parent can feel at almost nineteen to 21 weeks; this baby movement is termed "quickening". The baby at this stage of development can motility its facial muscles, yawn, and suck its thumb. The expanding uterus at 20 weeks is felt at the level of the belly push button.

In the US, women that have prenatal care usually have an ultrasound done at 20 weeks to determine that the placenta is attached normally and that the baby is developing without any problems.

It's Time for an Ultrasound

In the US, women that accept prenatal care normally have an ultrasound washed at xx weeks to determine that the placenta is attached normally and that the babe is developing without whatever problems. The baby'due south movements can be seen with Doppler imaging, and commonly the sex of the babe can be determined at this time, so if you want to be surprised about the sex of your baby at delivery, allow your doctor know before the Doppler ultrasound is started!

Shown hither is a 2D ultrasound (inset) contrasted with a 4D ultrasound, both at 20 weeks.

At 24 weeks, the baby may weigh 1.4 pounds and can respond to sounds.

Baby's Development at 24 Weeks

At 24 weeks, the baby may weigh one.4 pounds and can respond to sounds. Doppler studies bear witness the audio response by measuring movement and heartbeat rates. Sometimes the baby will develop hiccups that the female parent can feel! The infant's inner ear canals are adult at 24 weeks, so researchers speculate the fetus can sense its position in the uterus.

At 28 weeks, the baby normally weighs about 2 and one-half pounds and has developed to the point that if the baby is birthed prematurely for any reason, the chances are good that the infant will survive, but usually would require a hospital stay.

Baby's Development at 28 Weeks

At 28 weeks, the baby usually weighs well-nigh 2 and one-half pounds and has developed to the point that if the baby is birthed prematurely for any reason, the chances are proficient that the infant will survive, but usually would crave a hospital stay. Your doctor may discuss signs of premature labor and propose you (and your partner) accept classes on what to practise at the time of delivery of your full-term infant.

At 32 weeks, many babies weigh about 4 pounds, and have movements that the mother can feel.

Baby's Development at 32 Weeks

At 32 weeks, many babies weigh almost 4 pounds, and have movements that the mother tin can feel. Your doctor may ask you to make notes about the baby's movements and discuss breastfeeding and other options forth with scheduling visits every two weeks until you deliver the baby. Some women begin to leak a xanthous fluid from their breasts around this time; this is normal. This fluid is termed colostrum, and its presence indicates the breasts are primed to start producing milk for the newborn baby.

At 36 weeks the baby is about ready to be delivered and has reached an average length of 18.5 inches from head to heel length and weighs about 6 pounds.

Baby's Evolution at 36 Weeks

At 36 weeks the baby is virtually ready to be delivered and has reached an average length of xviii.v inches from caput to heel length and weighs almost 6 pounds. However, a infant'due south weight and length are quite variable and are influenced by the baby's genetics, the infant's sex, and many other factors. During this fourth dimension, the baby has begun to rotate itself into the delivery position of head first into the pelvis. At 37 weeks, the baby has completed evolution of all organ systems to a level that should allow it to survive and continue its growth outside the uterus without the close hospital monitoring that is usually done with premature babies; consequently, the pregnancy is considered "at term" at 37 weeks and beyond.

Delivery, due or birth date is calculated by estimating a 40 weeks delivery date, calculated after the first day of the mother's last period.

Nascence!

Delivery, due or nascency appointment is calculated by estimating a twoscore weeks delivery date, calculated after the first day of the mother's concluding period. This is an estimated appointment; the normal vaginal delivery birth can occur easily between 38 and about 42 weeks and is considered an early on or belatedly term pregnancy. However, virtually babies are delivered earlier 42 weeks. Depending on diverse circumstances and complications, the doctor may need to induce labor and commitment in some women, while others may require a surgical delivery (Caesarean section or C-section). For nigh people, especially first-time parents, birth of an baby is a life-irresolute event!

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IMAGES PROVIDED BY:

Dr. David M. Phillips / Visuals Unlimited / Getty Images
3D4Medical.com / Getty Images
Nestle / Petit Format / Photo Researchers, Inc.
Jose Manuel Gelpi Diaz / iStockphoto

REFERENCES:

Cleveland Clinic: "Fetal Development: Stages of Growth." Reviewed 04/xvi/2020.
UpToDate: "Assessment of Fetal Lung Maturity"
American Pregnancy Association: "Fetal Development"

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Source: https://www.onhealth.com/content/1/fetal_development_stages