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The event that all 23 people have different birthdays is the same as the event that person 2 does not have the same birthday as person 1, and that person 3 does not have the same birthday as either person 1 or person 2, and so on, and finally that person 23 does not have the same birthday as any of persons 1 through 22. Let these events be ...
One twin may also fail to develop a proper heart and become dependent on the pumping activity of the other twin's heart, resulting in twin reversed arterial perfusion. [2] If one twin dies in utero, blood accumulates in that twin's body, causing exsanguination of the remaining twin.
The first ten weeks of gestational age is the period of embryogenesis and together with the first three weeks of prenatal development make up the first trimester of pregnancy. From the 10th week of gestation (8th week of development), the developing embryo is called a fetus.
Following a stillbirth, women are at higher risk of another one; however, most subsequent pregnancies do not have similar problems. [149] Worldwide in 2019 there were about 2 million stillbirths that occurred after 28 weeks of pregnancy, this equates to 1 in 72 total births or one every 16 seconds. [150]
He was 128 days premature, 21 weeks 5 days gestation, and weighed 624 g (1 lb 6 oz). He survived. [210] [211] In 2014, Lyla Stensrud, born in San Antonio, Texas, U.S., became the youngest premature baby in the world. She was born at 21 weeks 4 days and weighed 410 grams (less than a pound). Kaashif Ahmad resuscitated the baby after she was born.
Up to the 13th week of pregnancy, the risk of miscarriage each week was around 2%, dropping to 1% in week 14 and reducing slowly between 14 and 20 weeks. [157] The precise rate is not known because a large number of miscarriages occur before pregnancies become established and before the woman is aware she is pregnant. [157]
Down syndrome is the most common chromosomal abnormality, [26] occurring in about 1 in 1,000 babies born worldwide, [1] and one in 700 in the US. [18] In 2015, there were 5.4 million people with Down syndrome globally, of whom 27,000 died, down from 43,000 deaths in 1990.
Women are 4-5 times more likely to develop a clot during pregnancy and in the postpartum period than when they are not pregnant. [25] Hypercoagulability in pregnancy likely evolved to protect women from hemorrhage at the time of miscarriage or childbirth. In developing countries, the leading cause of maternal death is still hemorrhage. [25]