Fetal Development in the 1st Trimester of Pregnancy

Fetal Development in the 1st Trimester of Pregnancy

The first trimester itself includes weeks 1 to 12 of pregnancy. In this trimester, you will experience various early symptoms of pregnancy. Such as morning sickness, changes in the breasts, excessive fatigue, changes in emotions, etc.

Everything is a natural occurrence and will disappear slowly. The most important thing to do in the 1st trimester of pregnancy is to maintain the nutritional intake of pregnant women / nutrition of pregnant women. This is because the first trimester is the most important period in the early growth of the fetus.

Also Read: Leopold 1-4 Examination of Pregnant Women

First Week of Trimester 1 of Pregnancy

This week, my mother was still menstruating. Although fertilization has not yet occurred, this week is included in the 1st trimester. This week, the hormone FSH(Follicle Stimulating Hormone) begins to be produced to help the fertilization process. The fertilization process (the process of meeting sperm and egg cells) itself will only occur in the next 12 to 14 days. Therefore, the age of the fetus is only calculated after 2 weeks of pregnancy. To help the fertilization process.

It is highly recommended for mothers to stop all habits that are not good for pregnancy. The three main things to avoid are cigarettes, alcohol, and illegal drugs, as all of them can affect fetal development and can cause defects in the fetus. Pregnant women need folic acid of 400mcg (0.4mg) per day. Folic acid is very important to help reduce the risk of fetal brain development disorders. Therefore, you are encouraged to take folic acid supplements. Folic acid can be obtained from foods such as eggs, nuts, days and green vegetables. Folic acid is very important to consume, especially from the last menstruation until the fifth week of pregnancy.

Second Week of Trimester 1 of Pregnancy

This week is a good time for conception, because this week is the mother’s fertile period. Especially if you have a regular menstrual cycle, which is every 28 days. This is because ovulation (the exit of the egg from the ovaries) occurs in the middle of menstruation, around days 12 to 14. At this week, the menstrual period ends and goes into the proliferation period or growth period of the uterus to prepare for pregnancy. There will be an increase in the hormone estrogen and the hormone FSH. The hormone FSH will play a role in developing satau or more follicles that later turn into mature eggs. This cell will move from the ovaries to the fallopian tubes, as it waits to be fertilized by the sperm cell.

When the mother has sexual intercourse this week, of all the sperm cells secreted by the mother’s partner (about 200-300 million) during ejaculation, only about 300-500 cells can reach where the egg is located(tubal ampula). And there is only one sperm cell that is able to fertilize the egg. In order for fertilization to occur perfectly, on the contrary, the mother maintains health by eating nutritious food, exercising, and resting with sufficient time.

Third Week of Trimester 1 of Pregnancy

The early stages of pregnancy begin this week. After your partner ejaculates, the sperm cells released will undergo an adjustment period of 7 hours in the vagina. After that, the sperm that comes out will compete to reach the fallopian tubes, which takes about 10 hours. Sperm cells that make it only take 20 minutes to fertilize an egg. Fertilization can last up to 24 hours which will produce a zygote.

In a matter of days, the fertilized mother’s egg will divide into 2 cells, then 4 cells, and so on. On the third day, the cell will divide into 16. From the o’aused, these cells that continue to divide (morula) will move towards the uterus.

This change itself will produce a combination of Y chromosomes, then the baby conceived will be male. If the sperm carries the X chromosome, then the baby will be female.
At week 2 of this trimester of pregnancy, you may experience some early signs of pregnancy. Hormonal changes will make the mother feel tired often, breasts feel sore and tense, often bad mood, and nausea / morning sickness. Mother needs adequate nutrition, including;

  • Protein, which is necessary for the growth of new tissue.
  • Calcium is about 1200 mg per day, for bone and tooth growth. Calcium can be obtained from dairy products.
  • Iron, approximately 30 mg per day, to increase the volume of the embryo. Iron can be obtained from green vegetables, raw meat, and eggs.

Fourth Week of Trimester 1 of Pregnancy

This week the embryo will begin to undergo the formation of embryonic organs. The embryo itself consists of 3 layers.

  1. Endoderm layer, deepest layer. Organs formed: liver, lungs, intestines, and digestive tract.
  2. The mesoderm layer, the middle layer. Organs formed; kidneys, heart, genital muscles, and bones.
  3. Ectoderm layer, which is the outermost layer. Organs formed; hair, skin, eyes, and nervous system.

In addition, the embryo will form the umbilical cord, and placenta. The placenta serves to secrete pregnancy hormones, such as progesterone and estrogen that help maintain pregnancy. In addition, the placenta also sends oxygen and nutrients to the fetus.

On the other hand, amniotic fluid will produce amniotic fluid that serves to protect the embryo. The fetus that floats in the amniotic fluid will be protected from the impact that the mother experienced. Amniotic fluid also helps maintain the fetal body temperature.

Fifth Week of Trimester 1 of Pregnancy

This week, the embryo is 3 weeks old. This week also the fetus is susceptible to fetal disspay disorders. The shape of the embryo is also beginning to be clearly visible. The embryo is shaped like a tube and a neural groove that is shaped extending from top to bottom. The formation of the primitive brain and heart began this week.

This week, you no longer menstruate. Levels of hCG (huma chorionic gondotrophin) will increase. This level will be detected by the pregnancy test tool that the mother uses. Meet the pregnancy nutrients that you need during pregnancy.

Sixth Week of Trimester 1 of Pregnancy

Stages of pregnancy trimester 1

This week the embryo is shaped like a tadpole. Ear plates, eye plates, pharyngeal curves and arm rigi begin to form. In addition, the brain, heart, blood vessels, nervous system, tongue, amniotic fluid, and placenta are also being formed. Blood cells begin to form, and small blood vessels appear. Finally connect the embryo with the placenta or ari-ari.

Mother has started to be able to make a visit to the obstetrician or midwife to check the condition of pregnancy. Usually the mother will be encouraged to check the pregnancy at any of the following times.

  • Every 4 weeks until pregnancy reaches 7 months of age.
  • Every 2 weeks at the age of 7 months and above.
  • Every 1 time a week for gestational age entering the age of 9 months.

Week 7 Trimester 1 Pregnancy

The eyes and ears of the fetus began to develop rapidly this week. The umbilical cord has also been formed. The nostrils have formed and the shape of the nose begins to protrude. The heart cavity begins to flow blood. The digestive and respiratory systems begin to form.

  • Age of the fetus: 5 weeks
  • Embryo size: 0.36 mm – 1 mm
  • Embryo weight: + 1 gram

Week 8 trimester 1 pregnancy

The embryo’s brain is progressing rapidly this week. Part of the face began to be clearly visible, his mouth began to open. His feet and hands have also begun to look in shape. Share also with the head, chest, and stomach that have begun to form. The back of the embryo has increased in length and has an embryonic skeleton that still consists of cartilage.

  • Age of the fetus: 6 weeks
  • Embryo size: 14 mm – 20 mm
  • Embryo weight: + 3 grams

Week 9 trimester 1 pregnancy

The embryo has started to form like a young baby and has started to move. Parts of the eye such as the retina and iris have begun to exist even though the eye has not been able to open, because the eyelids have not formed perfectly. The indention of the fetal finger is already visible and the upper arm has formed. Development is faster than the thighs and calves. The embryo’s genitals began to grow this week.

You may start urinating often. Do not forget to maintain fluid intake to avoid the risk of dehydration. Mother may not look pregnant, because the stomach has not been too enlarged, but the hip circumference has begun to feel wider.

  • Age of the fetus: 7 weeks
  • Embryo size: 22 mm – 30 mm
  • Embryo weight: + 4 grams

Week 10 first trimester of pregnancy

The embryo’s tail had disappeared, its face already resembled a human, ears, and eyelids had begun to form. The mother has started to be able to feel the kick which is the movement of the fingers and toes. Brain cells divide rapidly, forming 250,000 new nerve cells every second.

This week, you may not need maternity clothes, but the breast size may have started to enlarge until the bra you use starts to feel uncomfortable. Therefore, use a bra with a larger size.

  • Age of the fetus: 8 weeks
  • Embryo size: 31 mm – 42 mm
  • Embryo weight: + 5 grams

Week 11 of the First Trimester of Pregnancy

Prospective babies have started to be called fetuses because the period of organ formation has ended. Since this week, this period of lengthening, enlargement, and refinement begins. It’s about the size of your mother’s palm. The movement of the mother’s fetus can already be seen through ultrasound examination. Symptoms of morning sickness. This is because the production of hormones has been taken over by the placenta. So, the appetite that was previously lost will return, so that the mother can be more comfortable in consuming the necessary nutrients. Normally, mothers experience weight gain of 0.5 kg per week after no longer experiencing nausea or mutah.

  • Age of the fetus: 9 weeks
  • Embryo size: 44 mm – 60 mm
  • Embryo weight: + 8 grams

Week 12 of the First Trimester of Pregnancy

This week is the last week of the 1st trimester of pregnancy. The mother’s stomach begins to look enlarged and the size of the clothes begins to increase. So, wear loose clothes so that you feel comfortable.

To maintain stamina, mothers can exercise during light pregnancy such as walking for 30 minutes in the morning. In addition, you can also do kegel exercises that are useful for strengthening the pelvic muscles. The trick, contracting the muscles around the vagina such as when the mother resists the desire to urinating. Hold for 8-10 seconds and do it approximately 25 times a day.

  • Age of the fetus: 10 weeks
  • Embryo size: 60 mm
  • Embryo weight: + 8- 14 grams
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