In this article, we will tell you, from which week begins each trimester, and also about what features of the course of pregnancy you will be able to notice, depending on its term.
Sometimes doctors use a simplified method when calculating the gestational age - the maximum waiting period for a child of 42 weeks is divided into 3 equal terms, 14 weeks each. Thus, the 2 trimester of pregnancy with this method of counting will start from 15 weeks, and 3 from 29.
However, the most common method is using a special table, which lists all the trimesters of pregnancy by week.
We will consider the most significant features and changes in the entire period of pregnancy for weeks of each trimester, while breaking the entire waiting period for the child will be as shown in the table.
1 trimester of pregnancy by week
1-3 weeks. The beginning of the waiting period begins with the first day of the last month. A little later, the egg is fertilized and the tiny embryo attached to the walls of the uterus. You do not even know what is happening inside of you, while waiting for the next menstruation to come.
4-6 week. In the body of a woman, a hCG hormone is produced, during this period, most expectant mothers find out about their situation using a pregnancy test. A tiny embryo begins to form a heart. Some women begin to experience malaise, as well as nausea in the morning.
7-10 week. The future baby is rapidly growing and developing, its mass is about 4 grams. Mommy can add a little weight, but no external changes are observed. Most girls suffer from toxicosis in full.
11-13 week. Time for the passage of the first screening test, which includes ultrasound diagnostics and a biochemical blood test to determine the probability of possible chromosomal abnormalities in the fetus. Toxicosis, most likely, already recedes. The baby has a cardiovascular system, GIT, spine and face. By the end of the first trimester, its height reaches 10 cm, and the body weight is about 20 grams.
2 trimester of pregnancy by week
14-17 week. The kid actively moves in the tummy of his mother, but most pregnant women do not feel this yet. Fetal growth reaches 15 cm, and weight is about 140 grams. The very future mother also actively adds weight, and by this time her increase can reach 5 kg.
18-20 week. During this period, most women get acquainted with the sensation of the stirring of their baby. The tummy already so strongly stands out that it can not be hidden from prying eyes. The baby develops not by the days, but by the hour, its mass reaches 300 grams, and the height - 25 cm.
21-23 week. At this time you will have to pass a second screening test. Very often it is on the second ultrasound that the doctor can determine the sex of the baby, whose mass reaches 500 grams.
24-27 week. The uterus becomes quite large, and the future mother may experience discomfort-a feeling of heartburn and heaviness in the stomach, leg cramps, etc. The baby has occupied the entire uterine cavity, its mass reaches already 950 grams, and the height is 34 cm. His brain was fully formed .
3 trimester of pregnancy by week
28-30 week. The load on the kidneys of a pregnant woman increases every day, the fetus develops incredibly rapidly - now it weighs about 1500 grams, and its growth reaches 39 cm. Preparation of lightweight baby for independent breathing begins.
31-33 week. During this period you will undergo another ultrasound, on which the doctor will even be able to take photographs of the face of the baby. Its parameters reach 43 cm and 2 kg. The future mother increasingly experiences training bouts, the body is preparing for the forthcoming birth.
34-36 week. All the organs and systems of the baby are formed, and he is ready to be born, now before the term of childbirth he will only gain weight. He becomes cramped in the tummy of his mother, so the number of perturbations decreases. The weight of the fruit reaches 2.7 kg, height - 48 cm.
37-42 a week. Usually during this period comes the logical termination of pregnancy - childbirth, the baby is born. Now he is already considered full, and the development of the lungs allows him to breathe on his own.