First trimester of pregnancy
Despite the fact that the development of the baby begins from the moment of fertilization of the egg, the beginning of pregnancy is considered the first day of pregnancy the last months before conception. It is from this day onwards that the female body begins to prepare for the upcoming changes. By about the 12-16 day of the cycle, there is maturation of the egg cell and thickening of the endometrium (inner mucosa of the uterus), where the fetal egg is subsequently implanted. The sexual intercourse performed during this period is most conducive to conception.
The rate of maturation of the egg cell depends on the length of the menstrual cycle, the hormonal background and the individual features of the woman. Ovulation doesn’t always happen on Day 12 to 16. The norm is the period from the 10th to the 22nd day of the cycle.
The first changes in her body a pregnant woman can feel about 7 to 10 days after conception – at the fourth obstetrical week of pregnancy. That’s when the expectant mom’s hormonal background begins to change. Rapid growth of progesterone and HCG (a hormone produced by the fetal germ shell – chorion) prevents the onset of another menstrual bleeding. In addition, “hormonal storm” occurring in the pregnant body can cause unpleasant symptoms such as nausea, bloating, impaired appetite, changing taste preferences, $ dizziness, weakness, etc. It is possible to diagnose pregnancy by laboratory methods in about 5 obstetrical weeks, that is, about 3 weeks after conception.
Before the 12th week of pregnancy there is rapid development of the embryo. At five to six weeks (3-4 weeks after conception), he has a nerve tube formed, followed by the brain and spinal cord. There is a heartbeat and fleeting limbs, begins laying all the most important organs. To make everything happen without glitches, the expectant mother needs to monitor her health and well-being, get a full diet and, if necessary, take vitamins. During this period it is advisable to register in the women’s consultation and take all the necessary tests.
At 7-8 weeks, the embryo forms the face, limbs, umbilical cord, as well as the digestive tract. 9-10 – placenta, large blood vessels, respiratory and genitourinary systems, as well as reproductive organs. By this time, the size of the baby is no more than 2.5 cm, and the weight is about 2 grams. During this period, the baby begins to make the first movements, which are not yet felt by the mother.
By the end of the first trimester of pregnancy (11-14 weeks), the fetus weighs 20-25 g and its size is approximately 7-8 cm. Internal organs are fully formed. It is possible to determine how safely this happened with the help of ultrasound.
Second trimester of pregnancy
By the beginning of the second trimester, the health of the pregnant person tends to improve. Significantly enlarged breasts, abdomen begins to appear The fruit as well as the placenta are fully formed. Some internal organs, such as kidneys, are already functioning. By the 15th week of pregnancy, the fetus reaches a size of 10 cm, cannon hair appears on its body, nervous system, skeleton and muscles develop.
At 17-18 weeks, the fetus begins to appear a subcutaneous fat layer, a blink reflex occurs, hearing develops. The genitals are fully formed, so that using the ultrasound can already determine the sex of the baby. By week 20 of pregnancy, the fetus weighs about 300g. His movements become more distinct and intense, so the expectant mum can already feel them.
Repeating and lean women can feel staggered as early as the 18th week of pregnancy. On the contrary, pregnant women with a tight build may not feel the baby’s movements a little longer until the 21-22 week.
At 21-22 weeks, the fetus continues to develop a musculoskeletal and reproductive system. From weeks 23-24, the fetus begins to grow rapidly and increase weight. By the end of the second trimester, the pregnant woman may feel uterine contractions. These are so-called Brexton-Hicks training fights.
The toddler by week 25-26 weighs approximately 700g. In case of premature birth with due care and absence of developmental pathologies it can be released.
Third trimester of pregnancy
At 27-28 weeks of pregnancy, the fetus continues to grow intensely. His movements are becoming more active. Cannon hair on the body begins to fall out gradually, and hair cover forms on the head.
By the 30th week of pregnancy, the fetus weighs just over a kilo. The uterus pregnant by this time has impressive sizes. By shifting her internal organs, she pressures her diaphragm, causing the woman to develop difficulty breathing. From 30 weeks pregnant she has maternity leave.
By week 32, the fruit already weighs about one and a half kilograms. Due to her growing abdomen, the woman has a shift in her center of gravity, resulting in back pain. At 33-34 weeks, the fetus takes up all the space in the uterus. It becomes difficult for him to turn over, so he generally assumes the position from which he will be most comfortable to be born – head down. If this has not happened, the expectant mother needs to do special exercises that help to flip the baby.
By the 35th week, the baby’s lungs are finally mature, so that in case of premature birth the baby is likely to have no breathing difficulties. The subcutaneous fat layer continues to thicken, the thermoregulation system is improved.
By week 37, the baby is considered mature and the pregnancy is premature. The woman tends to experience severe discomfort. Training fights become more palpable. Starting from this period and up to 42 weeks, childbirth can occur at any time.