First trimester

First trimester of pregnancyPregnancy lasts approximately 40 weeks and is calculated from the first day of your last period, although conception will probably not have taken place until around two weeks afther this. Pregnancy is divided into three parts known as trimesters. The first covers weeks 1 - 13, the second trimester weeks 14 - 26 and the third trimester week 27 until birth.

During the first trimest, your baby will evolve from a cluster of cells into a recognizable fetus measuring about 3 inch (80 mm). All the major organs, muscles and bones will be formed. Until the placenta becomes mature enough to take over, your pregnancy is supported by maternal hormones, which also contribute to early symptoms such as nausea and tiredness. Although you may not look pregnant in the first trimester, you will almost certainly feel pregnant.

1 & 2 weeks pregnant

It may seem a bit strange, but the first week of your pregnancy is actually the beginning of your last menstrual period before you become pregnant. Why is that? Doctors and other health care professionals calculate your due date by counting 40 weeks from the start of your last cycle. That means they count your period as part of your pregnancy even though your baby hasn't been conceived yet. Conception typically occurs about two weeks after the start of your last menstrual period.

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3 weeks pregnant

A great deal is happening, even though your pregnancy is in its earliest stage. Ovaries lie free in your pelvis; they are close to the uterus and Fallopian tube. At the time of ovulation, the end of the tube (called the fimbria) lies close to the ovary. Some researchers believe this tube opening covers the area on the ovary where the egg is released at the time of ovulation. The release site on the ovary is called the stigma.

 

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4 weeks pregnant

Once your baby is conceived, he or she gets to work right away. The next step in the process is cell division, Within about 12 hours after fertilization, your one-celled zygote divides into two cells and then those two each split into two, and so on, with the number of cells doubling every 12 hours.

4 weeks pregnant

 

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5 weeks pregnant

eight of your pregnancy your baby’s cells multiply rapidly and they begin to perform specific functions. This process of specialization is called differentiation. It’s necessary to produce all the different cells that make up a human being. As a result of differentiation, your baby’s main external features also will begin to take shape. No longer just a mass of cells, your baby - now officially called an embryo - is starting to take on a distinct form. This article has moved to an other website of ours, namely babyboyandgirlnames.com. Read the full article about 5 weeks pregnany there. 5 weeks pregnant

6 weeks pregnant

Growth is rapid during the sixth week, during which your baby will triple in size. Formation of baby' s facial features is in its early stages. Optic vesicles, which later form the eyes, are beginning to develop. Passageways that will make up the inner ear also are beginning to form. When 6 weeks pregnant, an opening for the mouth is formed by the in growth of tissue from above and from the sides of the face. Below the mouth, where the neck will develop, are small folds that ultimately will become your baby’s neck and lower jaw. 

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6 weeks pregnant

 

7 weeks pregnant

In week 7 of pregnancy the umbilical cord, the vital link between your baby and your placenta, is clearly visible starting near the site where your baby implanted in your uterus.

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7 weeks pregnant

 

8 weeks pregnant

Your baby’s fingers and toes begin to form this week, although they’re still webbed. His or her tiny arms and legs are growing longer and more defined. Paddle-shaped foot and hand areas are evident. Wrists, elbows and ankles are clearly visible. Your baby may even be able to flex at the elbows and wrists. The eyelids also are forming. Until they’re done growing, your baby’s eyes will appear open. This is also the week your baby' s ears, upper lip and tip of the nose begin taking on recognizable form. Your baby' s digestive tract is continuing to grow, especially the intestines. Heart function and circulation are, now that you're 8 weeks pregnant, more fully developed. Your baby’s heart is pumping at about 150 beats a minute, about twice the adult rate.

 

8 weeks pregnantYou and your body - Week 8 of pregnancy

The changes to your body are becoming more noticeable as your breasts and nipples enlarge and become sensitive. Your vagina changes from light to dark pink, and you may notice an increased vaginal discharge. It is time for regular monitoring of your pregnancy.

Your growing baby - 8 weeks

The fetus is now about 0.7 inch (1,8 cm) long, which is 10.000 times bigger than at conception. All the major organs are present, although still developing, The ears and eyes have formed and the skin covering the eyes will eventually split to form the eyelids. The middle ear, which controls balance as well as hearing, is also developing. The heart is now pumping with a regular beat, and blood vessels can be seen. As the arms and legs grow longer, the fetus begins to move around and starts to kick, although it is still too small at this stage for you to be able to feel it.

9 weeks pregnant

When 9 weeks pregnant, your baby is looking less like a tadpole and more like a person.

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9 weeks pregnant

 

10 weeks pregnant

By week 10 of the pregnancy, all of your baby's vital organs have begun to form. The embryonic tail has disappeared completely, and baby’s fingers and toes are fully separated. The bones of the skeleton are now forming. Your baby's eyelids are more developed, and the eyes look closed. The outer ears are starting to assume their final form.

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10 weeks pregnant

 

11 weeks pregnant

From week 11 until the time your baby is full term, he or she is officially described as a fetus. With all organ systems in place, growth becomes more rapid. From week 11 until week 20 of pregnancy - the halfway mark - your baby will increase his or her weight thirtyfold and will about triple in length. To accommodate all this growth, blood vessels in your placenta are growing larger and more numerous to keep up the supply of nutrients to your baby. His or her ears are moving up and to the side of the head this week, and his or her reproductive organs are developing

 

11 weeks pregnant

quickly, too. What was a tiny tissue bud of external genitalia has begun to develop into either a penis or a clitoris and labia majora, which will soon be recognizable.

You and your body - Week 11 of pregnancy

Any sickness should start to fade and you will begin to feel less tired. You should start to think seriously about ante-natal classes because private ones can get booked up quickly. Contact your hospital or the National Childbirth Trust, or ask at your doctor's surgery about local classes.

Your growing baby when 11 weeks pregnant

When 11 weeks pregnant, most of the major organs are formed, so the most vulnerable time will be over by the end of this week. The baby is now relatively safe from any congenital abnormalities and infections, excepting rubella. The external genitals have formed, along with either ovaries or testicles. The heart is now pumping blood to all the major organs of the body. The baby weighs around 0.25 ounce (7 gram) and is now about 1.6 inch (4.1 cm) long.

12 weeks pregnant

Your baby’s face takes on further definition this week, as the chin and nose become more refined. Week 12 also marks the arrival of fingernails and toenails. Your baby’s heart rate may speed up a few beats per minute. The end of week 12 of pregnany marks the end of your first trimester. As you enter the second trimester, all of your baby’s organs, nerves and muscles are formed and beginning to function together. Growth continues at a rapid pace, but baby is still small at this point.

 

12 weeks pregnantYou and your body - 12 weeks of pregnancy

You can expect to put on about one quarter of your pregnancy weight between now and week 20. You may be beginning to feel more energetic and generally better than during the past few weeks. You should consider telling your employer at this time that you are pregnant. Meanwhile, look at your lifestyle and be sure that your diet includes a sensible range of foods, for you and the unborn baby.

Your growing baby - Week 12

The baby's heart is beating at between 110 and 160 times a minute and its chest is beginning to rise and fall as it practises future breathing movements. Features are becoming more clearly defined and fingers and toes are now fully formed, with tiny nails beginning to grow. The baby can suck its thumb and it swallows amniotic fluid and passes it back as urine. When 12 weeks pregnant, the amniotic fluid is completely replaced every 24 hours. The baby is now about 2.1 inch (5,4 cm) long and weighs 0.5 ounce (14 grams)

13 weeks pregnant

Your baby’s eyes and ears are now clearly identifiable, although the eyelids are fused together to protect the developing eyes. They won’t reopen until about your 30th week. Tissue that will become bone is developing around your baby’s head and within the arms and legs. If you were able to sneak a peek at your baby this week, you might see some tiny ribs. Your baby is now able to move his or her body in a jerky fashion, flexing the arms and kicking the legs.

 

13 weeks pregnant

But you won’t be able to feel these movements until your baby grows a bit larger. Your baby may be able to put a thumb in his or her mouth, but sucking will come later.

You and your body - Week 13 of pregnancy

When you are 13 weeks pregnant, your uterus is enlarging at a noticeable rate and you will be able to see the first signs of a visible bump. Your nipples have become darker and the blue veins in your breasts are a lot more obvious.

Your growing baby - Week 13

The baby is now 2.9 inches (7,4 cm) long and weighs 0.8 ounce (23 grams). The bone marrow, liver, and spleen have now taken over production of blood cells. The bones are developing and the teeth are in place. The baby may already be practising lip movements to develop the muscles needed for the sucking reflex after the birth.