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According to the WHO, a preterm birth is defined as "babies born alive before 37 weeks of pregnancy are completed." [20] According to this classification, there are three sub-categories of preterm birth, based on gestational age: extremely preterm (fewer than 28 weeks), very preterm (28 to 32 weeks), moderate to late preterm (32 to 37 weeks). [20]
At 8 weeks of gestation when the fetus weighed 1 gram, the thymus could not be detected. In many of the 39 fetuses weighing around 1.3-14.7 grams, the thymus tissues could not be dissected by the group especially in the smaller fetuses due to its non-detection. Fetuses weighing more than or equal to 5 grams could be detected.
The term Advanced maternal age is used to describe women who are over 35 during pregnancy. [29] [30] Women who give birth over the age of 35 are more likely to experience complications ranging from preterm birth [30] [29] [31] and delivery by Caesarean section, [30] [31] to an increased risk of giving birth to a child with chromosomal ...
Gestational age: 8 weeks and 0 days until 8 weeks and 6 days old. 57–63 days from last menstruation. Embryonic age: Week nr 7. 6 weeks old. 43–49 days from fertilization. The embryo measures 18 mm (3 ⁄ 4 in) in length. Fetal heart tone (the sound of the heart beat) can be heard using doppler. Nipples and hair follicles begin to form.
Development before birth, or prenatal development (from Latin natalis 'relating to birth') is the process in which a zygote, and later an embryo, and then a fetus develops during gestation. Prenatal development starts with fertilization and the formation of the zygote , the first stage in embryonic development which continues in fetal ...
Recent evidence has indicated that CRL growth (and thus the approximation of gestational age) may be influenced by maternal factors such as age, smoking, and folic acid intake. Early in pregnancy gestational age 8 weeks, it is accurate within about +/- 5 days but later in pregnancy due to different growth rates, the accuracy is less. In that ...
During pregnancy the plasma volume increases by 40-50% and the red blood cell volume increases only by 20–30%. [22] These changes occur mostly in the second trimester and prior to 32 weeks gestation. [24] Due to dilution, the net result is a decrease in hematocrit or hemoglobin, which are measures of red blood cell concentration.
Low birth weight is a concern for medical providers due to the tendency of these infants, described as "premature by weight", to have a higher risk of secondary medical problems. X-rays are known to have possible adverse effects on the development of the fetus, and the risks need to be weighed against the benefits. [29] [30]