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Dating and growth in the first trimester

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Prenatal tests are tests done during pregnancy to check a woman's health and her baby's. They can detect conditions that can put a baby at risk for problems like preterm birth if they're not treated. Tests also can help health care providers find things like a birth defect or a chromosomal abnormality. Some prenatal tests are screening tests that can only reveal the possibility of a problem.
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Re-Dating in the First Trimester

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(PDF) Dating and growth in the first trimester | Tom Bourne - canelovsgolovkin.info

A normal, full-term pregnancy is 40 weeks, and can range from weeks. Each trimester lasts between 12 and 14 weeks, or about three months. Each trimester comes with its own specific hormonal and physiological changes. Being aware of the ways that your growing baby is affecting your body will help you to better prepare yourself for these changes as they happen. Pregnancy date counting starts with the first day of your last normal menstruation cycle, and conception takes place in week 2.
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Trimesters and Due Date

Obstetric ultrasonography is the use of medical ultrasonography in pregnancy , in which sound waves are used to create real-time visual images of the developing embryo or fetus in its mother's uterus womb. The procedure is a standard part of prenatal care in many countries, as it can provide a variety of information about the health of the mother, the timing and progress of the pregnancy, and the health and development of the embryo or fetus. The International Society of Ultrasound in Obstetrics and Gynecology ISUOG recommends that pregnant women have routine obstetric ultrasounds between 18 weeks' and 22 weeks' gestational age the anatomy scan in order to confirm pregnancy timing, to measure the fetus so that growth abnormalities can be recognized quickly later in pregnancy, and to assess for congenital malformations and multiple pregnancies twins, etc. Performing an ultrasound at this early stage of pregnancy can more accurately confirm the timing of the pregnancy and can also assess for multiple fetuses and major congenital abnormalities at an earlier stage. There is no difference, however, in perinatal death or poor outcomes for babies.
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Assessing gestational age by ultrasound can introduce a systematic bias due to sex differences in early growth. This cohort study included data on 1,, births recorded in the Swedish Medical Birth Register. As expected, adverse outcomes were lower in the later time period, but the reduction in prematurity-related morbidity was less marked for male than for female infants. After changing the pregnancy dating method, male infants born early term had, in relation to female infants, higher odds for pneumothorax Cohort ratio [CR] 2.
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