Throughout the 9 months of pregnancy, the embryo evolves until its complete formation, from zygote to baby. In the same way, the woman’s body and the symptoms she feels are changing as the fetus develops.
Although we often talk about pregnancy in quarters, we will briefly explain what happens in 9 months of pregnancy.
First month of pregnancy
It is practically impossible to accurately detect when fertilization occurs that initiates the pregnancy. Therefore, it is usually taken as a reference the day on which the last rule fell. Therefore, the first week of gestation would be the last week of menstruation.
The second week gives way to the follicular selection, where a set of chosen follicles will begin to grow, although finally, only one will be selected.
Later, in the third week of the process, the oocyte leaves the follicle containing it and travels through the fallopian tubes. This is what we know as ovulation. Here, it will be fertilized by the spermatozoid, continuing its development now as a zygote (a cell) and later as an embryo.
It will continue its path towards the uterus, where it will implant. This begins the release of the hormone beta-hCG, which is the hormone that detects the pregnancy test.
It is possible that due to the increase of this hormone the woman begins to notice some symptoms in this first month but of very soft form and practically imperceptible. It will not be until the absence of the next menstruation when she is truly aware of the pregnancy.
After implantation, gastrulation occurs. The cells of the epiblast divide to form cells of three different types that will be in the future the tissue of the baby. Mesoderm and notochord cells are also generated, which will act as a spine until it forms.
The embryo is so small that it can not yet be seen on an ultrasound.
Second month of pregnancy
In this second month originates the spinal cord, the brain, the heart, the intestine and the skin. Also begin to form the eyes, ears, nose and upper lip of the mouth. It is a month of great evolution in which the embryo begins to take human form with all that entails.
At one end of the embryo will generate a rounded head and thicker than the trunk, while at the other end will form a kind of tail.
This month is important because it is when the heart is formed, vital organ par excellence of the future child.
The changes in the mother are still not remarkable. Your belly still does not show up, although you may begin to feel some symptoms such as nausea, vomiting, tiredness … It can also happen that gestation progresses without symptoms, but this is not indicative of complication, there are simply women suffering from the symptoms of More soft or invaluable form.
Third month of pregnancy
From this month the embryo period ends and it is called the fetus. In the third month of pregnancy, the future baby has already developed all its organs, although, for the moment, they are not formed at all. They lack maturity and they have just evolved correctly. The genitals will also be defined, although it is too early to be able to accurately determine the sex of the baby.
Over these 4 weeks, the fetus grows to 7 cm and will weigh about 15-20 grams. Usually, you start to gain weight. In this 3rd month, the weight gain is approximately 10% of the total weight to be gained throughout the pregnancy.
The movement of the future baby throughout this month is quite intense: folds the fingers, frowns, kicks, squeezes the lips, etc. It is important to know this concern of the fetus not to be alarmed when the movements intensify. It is not caused for concern, but rather the opposite. This mobility that expresses the baby is one more proof that he is alive and that everything evolves correctly.
At the end of this month, the annoying symptoms caused by the hormone beta- hCG, such as nausea or vomiting, are reduced as levels of this hormone stabilize.
This month offers calm and tranquility to the future parents since after the three months is considered exceeded the risk of abortion. No startling problems should arise from now on.
In this phase, the connections between mother and fetus intensify even more, a fact that increases the attention given to food and lifestyle since all this will directly affect the future being.
Fourth month of pregnancy
In this month the fetus is covered with lanugo, a very fine hair that covers the skin when the body does not have enough fat so that acts as a body heat conservator.
The vocal cords are formed, although they will not be used by the baby until birth, so that at birth children cry, even cause them to cry, to check that the vocal cords work and that the newborn responds to the stimuli.
At this stage, the eyes of the fetus are particularly large, although it keeps them closed. They are widely separated from each other but the face is already well defined and the neck separating the head from the rest of the body can be perfectly distinguished. The teeth begin to sprout, although it is only the beginning of this process. The outer ear moves up.
When you begin to form the face, your muscles are able to perform the sucking movement and that is why the baby can suck his finger. A gesture they usually repeat during their first years of life.
The size of the fetus at the beginning of this month is 8.5 cm in length and can grow up to 18 cm. Its weight will be about 150-170 grams. The epidermal folds appear on the palms of the hands and on the fingers, the new being already has a fingerprint.
In addition, in this month, the baby begins to expel urine that is intermingled with the amniotic fluid. The functions of your sweat glands and sebaceous begin to develop. The intestine begins to fill with a thick substance secreted by the liver and called meconium.
The volume of your belly will continue to increase as well as your body weight. Noting the baby is something already habitual in this month because, by its size and development, its movements are common.
Fifth month of pregnancy
The cardiac chambers are delimited and the heart is already beating strongly. Other important changes also occur in this period in which the senses develop, such as taste, developing the taste buds. It also begins to perceive sounds and lights.
By the end of this month, the baby can reach up to about 22-25 centimeters.
You will notice that when you fall, the fetus moves much more and with more energy. This is because the baby fits better into the pelvis when you are standing up. For this reason, you will feel as if you are asleep, because your movements decrease considerably, while they increase when you are in a horizontal position.
In the last weeks of this fifth month of pregnancy, the second layer of teeth is created. Milk teeth have already formed inside the dental alveoli. In the brain, millions of neurons are created and this is already practically as it will be once formed and once it has been born.
Your navel may flatten or start to pop out. In this case, you will return to the site after giving birth. The uterus will move until it rises above the navel. This process causes your silhouette to become completely distorted and you lose the waist curves.
You no longer feel nauseous or have to vomit although you may have other types of discomfort such as heartburn or nasal congestion. This is because your digestion slows down, in addition to the changes of position of the baby and the pressure that exerts on you.
Sixth month of pregnancy
Regarding the hair of the future baby, you have already created eyebrows, hair, and eyelashes. The muscles also form and, thanks to that and to the length of the umbilical cord, can move with more energy than until now.
In addition, by recognizing the sounds clearly, responds perfectly to the stimuli, such as music. If you want to do the test you will see how the fetus moves when you put music in response to the sound stimulus you are receiving.
The evolution of the baby happens to measure from 27 cm to 32 cm approximately and weight about 450 grams to about 750-1000 grams. The various parts of the child’s body can be palpated through your abdominal wall.
Baby’s skin begins to become dull, picking up consistency. The baby can open and close his eyes, as well as make gestures such as tongue out. The proportions of the body begin to equal in relation to his head. Each time is better formed and is more like the newborn.
The second trimester is completed and the state of gestation is already evident. Your belly must already be quite large and the weight of the fetus increases so you are likely to feel tired, have backaches, discomfort or discomfort in certain postures and feel some swelling.
Seventh month of pregnancy
The last trimester of pregnancy begins. Fetal development is already advanced. Delivery is coming. It is normal to feel more tired and heaviness.In addition, it will cost you more sleep, make certain movements such as tying your laces or stooping to collect things from the ground. Your feet and ankles are likely to swell.
In this period the lungs develop and the skeleton becomes more consistent.In addition, the fat already begins to accumulate in your body, which will allow you to control the temperature after birth.
The amount of hair begins to diminish and the lanugo that covers his body disappears.
In this month the length of the fetus goes from 33 cm to 38 cm approximately, weighing up to about 1,100-1300 grams.
Due to this considerable increase in weight and length the baby’s movements begin to be more limited. It is more pressed against your bladder so you will not only notice it in the movements of the fetus but also in your frequent urge to urinate.
Pigments the iris of the eye and the skin. The pigmentation occurs thanks to cells called melanocytes that produce melanin.
Eighth month of pregnancy
The baby continues to lose the lanugo and increasing in weight and size, so they also continue to limit their movements and at the same time does not stop pressing, more and more, your bladder. During this month it will reach about 50% of the weight that reaches throughout the pregnancy.
The baby’s lungs are almost developed and that also means they take up more space, so in addition to feeling heavy, you will also notice when you go to bed. It will be normal for you to sleep more, since your movements, like those of the baby, will begin to be more limited and difficult.
addition to the light and sound, which had already developed, this month are also created olfactory neurons, a sign that the brain does not stop evolving. The baby’s first hiccups begin. The cause is that he is swallowing amniotic fluid, something that at the same time causes as a consequence spasmodic movements.
It is possible that you feel some acidity or that you are constipated during this phase. All these symptoms are very common and are due to the increase of progesterone in your body. You do not have to be alarmed. It is recommended to take lots of calcium, iron, folic acid, proteins and vitamin C. Your gestation state is very advanced so you must take good care of yourself, but do not stop making your life.
The tiredness during this last period is also quite normal. This happens, not only because of the weight gain, but it tends to fatigue a lot, if not because your uterus has widened in such a way that it pushes your side and this makes breathing difficult.
Ninth month of pregnancy
The baby descends into the pelvis and the head begins to engage in it. The stomach and intestine are working. Your skin is no longer wrinkled and is softer due to the fat cells that have already formed underneath it. The color of the skin is not so red anymore, but it starts to blush and is more like the definitive color that will have at the time of delivery.
As we have said, for some weeks now, the movements are smaller due to the increase in size and weight of the fetus, but this does not mean that you do not feel the presence of your future child. In fact, you should not spend a single day without feeling it, because that will mean that everything is going well.
At the end of this month, the fetus should measure about 43 cm and its weight increases in this period from about 1,980 grams to about 2,730 grams on average.
The movements feel more abrupt as if they were kicking since the baby has very little space to move. The head will move during these weeks down, preparing for childbirth, and you will be able to distinguish perfectly between a foot, back or a hand. The nails have already grown to cover all of their fingers.
The baby is able to breathe and perform the sucking and swallowing movements at the same time, which will allow him to feed on the breast milk when he is born. He also begins to make his own blood cells.
This month is especially long and worrisome for the mother, but with much enthusiasm. Childbirth is coming and there is a lot of desire to see the future child.
The end of pregnancy
In this last stage of the gestation period the baby has longer nails even than his fingers, both hands and feet, so he can scratch even scratch himself.
Its organs are completely autonomous and ready to leave the placenta and the belly of its mother. The uterus will be in charge of exerting the force and pressure necessary for the birth to occur.
The baby measures between 45 cm and 55 cm and weighs an average of between 2,520 grams and 3,670 grams.
You will feel strong contractions known as “Braxton Hicks contractions. ” The amniotic fluid is renewed every 3 hours. Your child’s intestine is filled with greenish black meconium, formed by the secretions of food glands, along with biliary pigment, lanugo, and cells of the intestinal wall.
The rupture of water and with it the delivery can occur at any time. You should be prepared to go to the hospital right away.
If after 42 weeks the baby has not seen the light, it is logical that the specialist responsible for monitoring your pregnancy will cause the childbirth, since the future son or daughter is ready to be born and can pose a risk that is There is more time than necessary in the womb of the mother.