Fetal Development: Stages of Growth
Dec 13, †Ј Stages of pregnancy. First trimester (week 1Цweek 12) Second trimester (week 13Цweek 28) Third trimester (week 29Цweek 40) Your developing baby. About Us. It reaches your uterus about 3Ц4 days after fertilization. The dividing cells then form a ball that floats around in the uterus for about 2Ц3 days. Pregnancy begins when the ball of cells attaches to the lining of your uterus. This is called implantation.
The start of pregnancy is actually the first day of your last menstrual period. This is called the gestational age, or menstrual age. Your healthcare provider will ask you about this date and will use it to figure out how far along you are in your pregnancy. Each month, your body goes through a whah cycle that can end in one of two ways. You will either have a menstrual period or become pregnant.
This cycle is continuously happening during your reproductive yearsЧfrom puberty in your teen years to menopause around age In a cycle that ends with pregnancy, there are several steps. First, a group of eggs called oocytes gets ready to leave the ovary for ovulation release of the egg. Positions on how to get pregnant eggs develop in small, fluid-filled cysts called follicles. Think of these follicles as small containers pregnanfy each immature egg.
Out of this group of eggs, one will become mature and continue on through o cycle. This follicle then suppresses all the other follicles in the group. The other follicles stop growing at this point. The mature follicle now opens and releases the egg from the ovary. This is ovulation. Ovulation generally happens about two weeks before your next menstrual period begins.
After ovulation, the opened stafes follicle develops into a structure called the corpus luteum. This secretes releases the hormones progesterone and estrogen. The progesterone helps prepare the endometrium lining of the uterus. This lining, is the place where a fertilized egg settles to develop. On average, fertilization happens about two weeks what are the stages of pregnancy your last menstrual period. When the sperm penetrates the egg, changes occur in the protein coating of the egg golf alignment sticks how to use prevent other sperm from entering.
The gender what are the stages of pregnancy your baby depends on what sperm fertilizes the egg at the moment of conception. Generally, women have a genetic combination of XX and men what size electrical wire for 200 amp service XY. As the mother, you provide each egg with an X. Each sperm can be either an X or pregnanch Y. Within 24 hours after fertilization, the egg begins rapidly dividing into many cells.
It remains in the fallopian tube for about three days after conception. Then the fertilized egg now called a blastocyte continues to divide as it stxges slowly through the fallopian tube to the uterus. Once there, its next job is xtages attach to the endometrium. This is called implantation. Before implantation wtages, the blastocyte breaks out of its protective covering.
When the blastocyte makes contact with the endometrium, the two exchange hormones to help the blastocyte attach. Some women notice spotting slight bleeding during the one or two days when implantation happens. At this point, the endometrium becomes thicker and the cervix the opening between your uterus and birth canal is sealed by a xre of mucus. Within three weeks, the blastocyte cells ultimately form a little ball, or an embryo.
Your developing baby has already gone through a few name changes in the first few weeks how to download mobile game pregnancy. Generally, your how much family allowance am i entitled to will be called an embryo from conception until the eighth week of development.
From the moment of conception, the hormone human chorionic gonadotrophin hCG will be present in your blood. This hormone is created by the cells that form the placenta food source for your baby in the womb. Even though this hormone is there from the beginning, it takes time for it to build within your body. It typically takes three to four weeks from the first day of your last period for the hCG to increase enough to be detected by pregnancy tests.
Most healthcare providers will have you wait to come in for what does veritas aequitas mean in english appointment until you have had a positive home pregnancy test. These ahat are very accurate once you have enough hCG circulating throughout your body. This can be a few weeks after conception.
When you call, your healthcare provider may pregbancy you if you are taking a prenatal vitamin. These supplements contain something called folic acid. Your baby will change a lot throughout a typical pregnancy. This time is divided into three stages, dtages trimesters. Each trimester is a set of about three months. So, if you are three months pregnancy, you are about 12 weeks. Traditionally, we think of a pregnancy as a nine-month process.
A full-term pregnancy is 40 weeks, or days. Depending on what months you are pregnant during some stges shorter and some longer and what week you deliver, you could stayes pregnant for either nine months or 10 months. This is completely normal and healthy.
Once you get close to the end of your pregnancy, there are several category names you might hear regarding when you go into labor. These labels stagees up the last few weeks of pregnancy. Babies that are born in the early term period or before may have a higher risk of breathing, hearing or learning issues than babies born a few weeks later pdegnancy the full term time frame.
This stands for how many days you currently are in the what are the stages of pregnancy week. The first trimester will span from conception to 12 weeks. This is generally the first three pregnabcy of pregnancy. As the fertilized egg grows, a water-tight sac forms around it, gradually filling with fluid. This is called the pfegnancy sac, and it helps cushion the growing embryo. During this time, the placenta also develops. The placenta is a round, flat organ that transfers nutrients from thee mother to the baby, and transfers wastes from the baby.
Think of the placenta as a food source for your baby throughout the pregnancy. In these first few weeks, a primitive face will take form with large dark circles for eyes.
The mouth, lower jaw and throat are developing. Blood cells stges taking shape, and circulation will begin. The tiny "heart" tube will beat 65 times a minute by the end of the fourth shages.
Your baby's facial features continue to develop. Each ear begins as a little fold what are the stages of pregnancy skin at preegnancy side of the head. Tiny buds that eventually grow into arms and legs are forming. Fingers, toes and eyes are also forming. The neural tube brain, spinal cord and other neural tissue of the central nervous system is well formed now. The digestive tract and sensory organs begin to develop too.
Bone starts to replace cartilage. At about 6 weeks, your baby's heart beat can usually be detected. Your baby's arms, hands, fingers, feet and toes are fully formed. Prebnancy this stage, your baby is starting to explore a bit by doing things like opening and closing its fists and mouth. Fingernails and toenails are beginning to develop and the external ears are formed. The beginnings of teeth are forming under the gums. Your baby's reproductive organs also develop, but the baby's gender is difficult to distinguish on ultrasound.
By the end of the third month, your baby is ate formed. All the organs and limbs extremities are present and will continue to develop in order to become functional. Since your baby's most critical development has taken place, your chance stxges miscarriage drops considerably after three months.
This middle section of pregnancy is often thought of as the best part of the experience. By this time, any morning sickness is probably gone and the discomfort of early pregnancy has faded.
The baby will start to develop ar features during this what are the stages of pregnancy. You may also start to feel movement as your baby flips and turns in the uterus. During this trimester, many people find out the what are the stages of pregnancy of the baby.
Your baby's heartbeat may now be audible through an instrument called a doppler. The fingers and toes are well-defined. Eyelids, eyebrows, eyelashes, nails and hair are formed. Teeth and bones become denser.
Your baby can even suck his or her thumb, yawn, stretch and make faces. The nervous system is starting to function. The reproductive organs and genitalia are now fully developed, and your doctor can see on ultrasound if you are having pregnacny boy or a girl. At this stage, you may begin to feel your baby moving around.
Conception and implantation
Jan 23, †Ј At 32 weeks in the third trimester, your baby's development continues: Your baby's bones are soft but fully formed. Movements and kicking increase. The eyes can open and close. Lungs are not fully formed, but practice "breathing" movements occur. Your baby's body begins to store vital minerals, such. First Trimester. After fertilization and implantation, a baby is at first just an embryo: two layers of cells from which all the organs and body parts will develop. Growing quickly, your baby is soon about the size of a kidney bean and constantly moving. The heart is beating quickly and the intestines are forming. Sep 11, †Ј Pregnancy lasts about 40 weeks, and has three phases or stages: the 1st, 2nd, and 3rd trimesters. Early symptoms of pregnancy may include constipation, headache, heartburn, extreme tiredness, and upset stomach. Symptoms vary from week to week during pregnancy. A pregnancy test can easily confirm if you are pregnant.
For a pregnant woman, feeling a new life developing inside her body is an amazing experience, even though she may not always feel her best at some points along the way. Pregnancy can be different from woman to woman, and even for the same mother from one pregnancy to the next.
Some symptoms of pregnancy last for several weeks or months, while other discomforts are temporary or don't affect all women. A normal pregnancy usually lasts about 40 weeks, counting from the first day of a woman's last menstrual period, which is about two weeks before conception actually occurs. During each trimester, changes take place in a pregnant woman's body as well as in the developing fetus, and a summary of these changes will be described below. About two weeks after a woman has her period, she ovulates and her ovaries release one mature egg.
The egg can be fertilized for 12 to 24 hours after it's released as it travels down the fallopian tube toward the uterus. If an egg meets up with a sperm cell that has made its way into the fallopian tube, it combines into one cell, a process that's known as fertilization or conception. At fertilization, the sex of the fetus is already determined, depending on whether the egg receives an X or Y chromosome from a sperm cell. If the egg receives an X chromosome, the baby will be a girl; a Y chromosome means the baby will be a boy.
According to the Cleveland Clinic, it takes about three to four days for the fertilized egg or embryo to move to the lining of the uterus, where it attaches or implants to the uterine wall. Once the embryo is implanted, the cells start to grow, eventually becoming the fetus and the placenta, which is tissue that can transport oxygen, nutrients and hormones from the mother's blood to the developing fetus throughout pregnancy. A woman will experience a lot of symptoms during her first trimeste r as she adjusts to the hormonal changes of pregnancy.
In the early weeks, the pregnancy may not be showing much on the outside of her body, but inside many changes are taking place. For example, human chorionic gonadotrophin hCG is a hormone that will be present in a woman's blood from the time conception occurs. Levels of hCG can be detected in a woman's urine about a week after she has a missed period, and it is why a woman will have a positive result on a home pregnancy test.
Other hormonal changes can contribute to pregnancy symptoms: Rising levels of estrogen and hCG may be responsible for the waves of nausea and vomiting known as morning sickness that a woman typically feels during her first few months of pregnancy. Despite its name, morning sickness can occur any time of day. A woman will also feel more tired than usual during the first trimester, a symptom that's linked with rising levels of the hormone progesterone, which increases sleepiness.
She may also need to urinate more frequently as her uterus grows and presses on her bladder. Early in pregnancy, a woman's breasts will feel more tender and swollen, another side effect of rising levels of pregnancy hormones. Her areolas, the skin around each nipple, will darken and enlarge. A pregnant woman's digestive system may slow down to increase the absorption of beneficial nutrients. But reduced mobility of the digestive system might also trigger such common complaints as heartburn, constipation, bloating and gas, according to the Office on Women's Health OWH.
Many parts of the body will work harder during pregnancy, including a woman's heart. Her heartbeat will increase to pump more blood to the uterus, which will supply it to the fetus. As more blood circulates to a woman's face, it will give her skin a rosier complexion, described as a "pregnancy glow.
Besides the physical changes in a woman's body, she may also experience emotional highs and lows in the early months of her pregnancy and throughout it. These emotions may range from weepiness, mood swings and forgetfulness to fear, anxiety and excitement.
A developing baby is called an embryo from the moment conception takes place until the eighth week of pregnancy. During the first month of pregnancy the heart and lungs begin to develop, and the arms, legs, brain, spinal cord and nerves begin to form, according to the American College of Obstetricians and Gynecologists ACOG. The embryo will be about the size of a pea around one month into a pregnancy, Burch said. Around the second month of pregnancy, the embryo has grown to the size of a kidney bean, he explained.
In addition, the ankles, wrists, fingers and eyelids form, bones appear, and the genitals and inner ear begin to develop. By the end of the second month, eight to 10 of the fetus' main organs will have formed, Burch said. At this stage of pregnancy, he stressed, it's extremely important that pregnant women do not take harmful medications, such as illegal drugs.
The first trimester is also the period when most miscarriages and birth defects occur. During the third month of pregnancy, bones and muscles begin to grow, buds for future teeth appear, and fingers and toes grow.
The intestines begin to form and the skin is almost transparent. By the second trimester, some of the unpleasant effects of early pregnancy may lessen or disappear as a woman's body adjusts to its changing hormone levels. Sleeping may get easier and energy levels may increase. Nausea and vomiting usually get better and go away, Burch told Live Science. But other symptoms may crop up as the fetus continues its growth and development.
Women feel more pelvic pressure, Burch said, adding that the pelvis feels heavy like something is weighing it down. A more visible baby bump appears as the uterus grows beyond a woman's pelvis, and the skin on her expanding belly may itch as its stretches, according to the OWH.
As the fetus is getting bigger and a woman is gaining more pregnancy weight in the front of her body, she may also experience more back pain, Burch said. Sometime between the 16th and 18th weeks of pregnancy, a first-time mother may feel the first fluttering movements of the fetus, known as quickening, Burch said. If a woman has had a baby before, she is likely to feel the fetus kicking, squirming or turning even sooner because she knows what to expect, he explained. Burch encourages his patients to take a "baby-moon" Ч a mini-vacation or weekend getaway Ч during the second trimester, and he said the best time to get away is around the 28th week of pregnancy.
A woman is generally feeling pretty good at this point, there's a lower risk of miscarriage and premature labor, and some health professionals may discourage airplane travel after the 36th week. In the second trimester , the fetus is growing a lot and will be between 3 and 5 inches long, Burch said. Sometime between 18 and 22 weeks, an ultrasound may reveal the sex of the baby , if parents want to know this information in advance.
By the fourth month of pregnancy, eyebrows, eyelashes, fingernails and the neck all form, and the skin has a wrinkled appearance. In addition, during the fourth month the arms and legs can bend, the kidneys start working and can produce urine, and the fetus can swallow and hear, according to ACOG. In the fifth month of pregnancy, the fetus is more active and a woman may be able to feel its movements.
The fetus also sleeps and wakes on regular cycles. A fine hair called lanugo and a waxy coating called vernix cover and protect the thin fetal skin. By the sixth month of pregnancy, hair begins to grow, the eyes begin to open and the brain is rapidly developing. Although the lungs are completely formed, they don't yet function. During the third trimester , as a woman's enlarged uterus pushes against her diaphragm, a major muscle involved in breathing, she may feel short of breath because the lungs have less room to expand, according to Johns Hopkins Medicine.
Her ankles, hands, feet and face may swell as she retains more fluids and her blood circulation slows. A mother-to-be will need to pee more frequently because more pressure will be placed on her bladder. She may also have more backaches and more pain in the hips and pelvis, as these joints relax in preparation for delivery.
Her face may develop dark patches of skin, and stretch marks may appear on her belly, thighs, breasts and backside. She may also notice varicose veins on her legs.
In the third trimester, a woman's breasts may experience some leakage of colostrum , a yellow liquid, as they get ready for breastfeeding, according to the OWH. The baby will drop lower in her abdomen. False labor, known as Braxton-Hicks contractions, may begin to occur as a woman gets closer to her due date. A "nesting instinct" may kick in as a mother-to-be and her partner baby-proof their home, shop for baby items, prepare the nursery and await their new arrival. During the final weeks of pregnancy, it will become harder to find a comfortable sleeping position, so women may be extremely tired, Burch said.
As delivery approaches, some women love the experience of being pregnant, while others may feel like they can't wait for it to end, Burch said. By the seventh month of pregnancy , the fetus kicks and stretches, and can even respond to light and sound, like music, Burch said. Eyes can open and close. During the eighth month of pregnancy, the fetus gains weight very quickly.
Bones harden, but the skull remains soft and flexible to make delivery easier. Different regions of the brain are forming, and the fetus is able to hiccup, according to ACOG. The ninth month is the home stretch of pregnancy, and the fetus is getting ready for birth by turning into a head-down position in a woman's pelvis.
The lungs are now fully mature to prepare for functioning on their own. The fetus continues to gain weight rapidly. The new definition of a full-term pregnancy is when a baby is born after 39 to 40 weeks it used to be 37 weeks , Burch said.
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