The 4th week of pregnancy (pregnancy week) at a glance
This happens in the 4th week of pregnancy with mom and baby …
After the egg cell was fertilized the previous week, it nests in the uterus at the beginning of the 4th week of pregnancy. This can be seen in what is known as implantation bleeding, which leads many women to believe that they are not pregnant and are not getting their periods. But not every woman has this implantation bleeding.
The fertilized egg arrives in the uterus about three days before implantation. If it cannot implant itself – for example because the mucous membrane is not sufficiently built up – it will be flushed out with the menstrual period in the coming week and the next menstrual cycle begins.
Also read: Am i pregnant These are the typical signs
If, on the other hand, it can implant itself, this is called “successful conception”. However, pregnancy tests are still very imprecise. Only a blood test, which the gynecologist can do, can give real certainty. But be patient: In the next week, a urine test from a drugstore or pharmacy can tell you whether you are pregnant or not.
Pregnancy test or not: There are women who observe changes in themselves as early as the 4th week of pregnancy, often without knowing that they are pregnant. Hormonally related pregnancy symptoms such as nausea, tiredness or general malaise can occur early in pregnancy. This often lasts for the first three months of pregnancy, but it usually gets better in the second trimester, i.e. from the 13th week of pregnancy.
Good to know: The best tips against nausea during pregnancy
The baby in the 4th week of pregnancy
About seven days after fertilization, the egg cell (now: germinal vesicle) nests in the uterus. Now the all-or-nothing principle takes effect: If external influences damage the embryo, the organism tries to repair this damage. If this does not succeed, the development stops and the pregnancy ends. If it succeeds, the embryo will continue to develop normally.
Before the embryo can really implant itself, it has to emerge from the egg shell. Then it bores into the lining of the uterus so that the exchange of oxygen, nutrients and other important substances can begin. Now the amniotic fluid cavity, the yolk sac and the placenta are formed.
The cells of the embryo are now still pluripotent, which means that every organ can develop from every cell in the unborn child. In the 4th week of pregnancy, however, the cells begin to specialize: From the cells that form the embryo (embryoblasts), a rounded germinal disc develops, which is composed of the three so-called germ layers:
- Endoderm (inner cotyledon)
- Mesoderm (middle cotyledon)
- Ectoderm (outer cotyledon)
When the embryo, amniotic fluid cavity, yolk sac and placenta are completely covered by the uterine lining, implantation is complete and the small person begins to grow. Even if it now only measures around 0.5 mm: in around nine months it will weigh around 3,300 grams and be around 52 centimeters tall!
>> Are you already looking for a nice first name for your baby? With our baby name generator you are guaranteed to find the perfect name.
From fertilization to child: the development of the fetus in the womb!
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Video by Aischa Butt
The placenta is an organ that only exists during pregnancy. It develops in parallel with the baby and supplies it with oxygen, nutrients, vitamins and other important substances. In addition, the baby can dispose of its metabolic products via the Platzenta.
In the placenta, the mother-to-be’s blood vessels border those of the baby so that vital nutrients and oxygen can be exchanged. The placenta also serves as a protection against many bacteria and pollutants. Unfortunately, some pollutants as well as alcohol, cigarette poisons and drugs can still reach the baby unfiltered. Alcohol, cigarettes and drugs should therefore be completely taboo during pregnancy.
Towards the end of pregnancy, the placenta begins to gradually store calcium and to age. This is what gynecologists pay special attention to when the due date is exceeded, because the more calcium has been stored, the more difficult it is for the placenta to take care of the baby. At birth, shortly after the baby is born, the placenta is then expelled as a so-called afterbirth, because then it no longer has any function.
The mother in the 4th week of pregnancy
A lot is happening in the mother-to-be’s body in the 4th week of pregnancy. The uterus is optimally prepared for the germ cell and the hormones that control the physical changes in the first few weeks of pregnancy can already conjure up typical pregnancy complaints: from a stuffy nose to excessive salivation to emotional ups and downs, especially those the expectant dad and the environment of the pregnant woman should be prepared.
Also interesting: Folic acid during pregnancy: so that your baby is born healthy
Thanks to the luteal hormone progesterone, all processes in the body are now much slower. This protects the baby and the pregnancy, but at the same time means that the mother-to-be is now often tired and limp and can also be constipated more often.
The hormones also make the uterus and breasts grow – in fact, many pregnant women notice very early on that the breasts are getting bigger and stretching.
Also read: Becoming a mommy: this is how your body changes during pregnancy
Smokers should be particularly careful: the baby is very sensitive at this stage of pregnancy. At the latest now, smoking should be completely stopped – and please really completely! Reducing is not enough. Don’t worry: the unborn child will not get any withdrawal symptoms if you stop smoking overnight. These are just stories to gloss over a cigarette or two.
Also read: Smoking during pregnancy: how dangerous is addiction for your baby
Alcohol and drugs can also cause the greatest damage in the first few weeks of pregnancy and should of course not be consumed.
Complaints or pain should always be clarified by a gynecologist: Better to go to the doctor once too often than too little, even if most of the complaints turn out to be harmless. Medicines or preparations may not be taken on their own – even if they are “only” natural products or food supplements. Take tea, for example: There are herbal teas that can trigger contractions. On the other hand, there are medications that can also be taken during pregnancy – every treatment should therefore be discussed with a gynecologist or midwife.
Also read: All pregnancy months at a glance
You can find more information about the course of pregnancy and baby’s development at Federal Center for Health Education (BZgA)
Overview of other pregnancy weeks:
<< This is the 3rd week of pregnancy (pregnancy week) at a glance
>> This is the 5th week of pregnancy (pregnancy week) at a glance
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Important NOTE: The information in this article is provided for informational purposes only and is not a substitute for diagnosis or advice from a doctor. If you have any uncertainties, urgent questions or complaints, you should contact your doctor.
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