Stages of pregnancy 1st trimester weeks,pregnancy process by month,tips for getting pregnant if you are overweight,early pregnancy symptoms experiences uk - Try Out

A typical pregnancy lasts 40 weeks from the first day of your last menstrual period (LMP) to the birth of the baby. Some of the changes you experience in your first trimester may cause you to revise your daily routine. At the end of 8 weeks, your baby is a fetus, and is nearly 1 inch long, weighing less than ⅛ of an ounce. Your baby is covered by fine, feathery hair called lanugo and a waxy protective coating called vernix.
Now halfway through your pregnancy, your baby is about 6 inches long and weighs about 9 ounces. Average birth weight is between 6 pounds, 2 ounces to 9 pounds, 2 ounces and average length is 19 to 21 inches long. Learning of a positive pregnancy diagnosis, a woman may feel immediate, intense emotion, ranging from complete joy to utter despair. A full-term pregnancy is considered to last 40 weeks from the first day of the pregnant woman's last menstrual period (LMP) prior to fertilization.
First Trimester - the first 12 weeks of pregnancy in which embryonic and early fetal development takes place. Fertilization, the fusion of the male sperm with the female ova in the fallopian tube to form a single cell called the zygote.
When the zygote reaches the uterus it has become a blastocyst (a small cluster of cells) that remains in the uterus for four or five days before it penetrates into the thickened endometrium (uterine lining). The American College of Obstetricians and Gynecologists (ACOG) defines the beginning of pregnancy at the completion of implantation into the lining of the uterus. During the early stages of embryonic development, a thin membrane called the amnion develops, which surrounds and protects the embryo. The outer cells of the embryo form projections, called "villi" that attach themselves to the uterine wall. Soon after implantation, the placenta secretes a hormone called HCG (human chorionic gonadotrophin). HCG is secreted into the urine of a pregnant woman, and is the basis of most commercial urine pregnancy test kits. Studies indicate that about 50-70% of neural tube defects (NTDs) could be prevented if women obtained sufficient amounts of folic acid before becoming pregnant and during pregnancy. Because the neural tube forms in the very early stages of embryonic development, initiating folic acid after pregnancy diagnosis is too late. The end of the first trimester marks the beginning of the fetal period (from 9-12 weeks), and is characterized by continued structural growth and development of the major organ systems and the external genital organs. The second trimester occurs during weeks 13-27 and is marked by accelerated growth, the development of reflex responses and muscular activity. Low birth weight - refers to babies weighing less than 2,500 grams at birth (5 lbs, 8 oz.).
Despite educational and medical interventions geared towards the prevention and arrest of pre-term labor, it still remains a significant clinical problem and leads to high rates of infant mortality and morbidity.


The health status of a woman prior to and during pregnancy is critically important for the health and well being of the woman, and for the outcome her pregnancy.
Monitor the pregnancy to assure adequate weight gain, fetal growth, fetal heart beat, blood pressure control, assessment of fetal position (later in pregnancy), and assessment to exposure to environmental and infectious agents that can impact pregnancy. Identify risk factors for pre-term labor, treat conditions that may cause pre-term labor, and teach women the signs and symptoms of early labor, so that they may seek medical attention promptly. Assess eligibility and provide referral for social welfare and entitlements programs available to the woman and her family. In many developing countries, prenatal care consists of monitoring weight and blood pressure, measuring the fetal heartbeat, providing a tetanus toxoid immunization, administration of folic acid and iron, syphilis testing (rarely done), and birth planning for potential complications during delivery. It is divided into three stages, called trimesters: first trimester, second trimester, and third trimester. The second trimester is weeks 13 to 27, and the third trimester starts about 28 weeks and lasts until birth.
If your baby is a girl, her uterus and ovaries are in place, and a lifetime supply of eggs has formed in the ovaries. Discomforts that started in the second trimester will likely continue, along with some new ones. As your due date approaches, your cervix becomes thinner and softer in a process called effacing that helps the birth canal (vagina) to open during childbirth. Most full-term babies fall within these ranges, but healthy babies come in many different weights and sizes. It is intended for general informational purposes only and does not address individual circumstances. Once formed, the rapidly dividing zygote travels towards the uterus (which takes about three days).
This process, called implantation occurs approximately 10 days after fertilization and marks the beginning of the embryonic period (development which occurs during the first eight weeks of pregnancy). The membrane contains amniotic fluid, which cushions the fetus and helps to maintain even temperature throughout pregnancy. This attachment becomes the placenta, a vascular spongy structure through which the embryo, and later the developing fetus, derives oxygen, antibodies and nutrients from the maternal blood supply.
HCG prevents the disintegration of the corpus luteum, which will secrete large quantities of estrogen and progesterone. Primitive nervous system development begins with the neural tube (the beginnings of the brain and the spinal cord).
There is a higher incidence of NTDs among females (60-70% female), and there are ethnic, geographic, and environmental differences. Women who could become pregnant should get 400 micrograms of synthetic folic acid each day, or eat food enriched with 100% of the daily value of folic acid.
The placenta is fully developed and the brain undergoes the most important period of growth.
All major organ systems continue to grow and mature including the brain, the kidneys and the lungs.


According to the 2002 ACOG Guidelines, survival prior to 24 weeks gestation is extremely rare and the likelihood of survival increases with time.
Despite a widespread desire to improve maternal care services, this lack of "hard" evidence has impeded the identification of effective interventions and thus the optimal allocation of resources.
This slide show will discuss what occurs to both the mother and baby during each trimester. As the baby grows and puts more pressure on your internal organs, you may find you have difficulty breathing and have to urinate more frequently. Your doctor will monitor the progress of your pregnancy with regular exams, especially as you near your due date. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Transport is facilitated by ciliated epithelium (epithelium are hair-like structures that wave actively in one direction) and subtle contractions of the fallopian tube.
Waste products also pass from the fetus back to the maternal blood supply through the placenta. Increased estrogen production also causes the enlargement of the uterus, breasts, and external genitalia.
The early diagnosis of pregnancy therefore can alert women and their health care providers to avoid exposures to potential teratogens (substances which cause the development of abnormalities in an embryo or fetus).
By approximately the 36th week, the fetal head may "drop" into the pelvis, a process called lightening. The guidelines note that the survival rates increase from 0% at 21 weeks gestation to 75% at 25 weeks gestation; and from 11% at 401-500 grams to 75% at 701-800 grams birth weight. In developing countries, routinely recommended antenatal care programs are often poorly implemented and clinical visits can be irregular, with long waiting times and poor feedback to the women." WHO Antenatal Care Randomized Trial, 2001.
Each pregnancy is different and even if you've been pregnant before you may feel completely different with each subsequent pregnancy. Never ignore professional medical advice in seeking treatment because of something you have read on the MedicineNet Site. Increased progesterone helps to maintain the endometrium, prevents uterine contractions during the pregnancy, and prepares the breasts for lactation. The heart begins beating during the 4th week, and limb buds (which eventually become the arms and legs) also develop by the fourth week. Long-term follow-up studies are being conducted to assess the degree of increased risk for cognitive and neurological deficit with younger and smaller babies.
By the end of eight weeks, all major body systems (circulatory, nervous, digestive and urinary systems) continue to develop and function.



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