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In human pregnancy, prenatal development is also called antenatal development. The development of the human embryo follows fertilization , and continues as fetal development . By the end of the tenth week of gestational age , the embryo has acquired its basic form and is referred to as a fetus .
In the US, the average age at which women bore their first child advanced from 21.4 years old in 1970 [11] to 26.9 in 2018. [4]The German Federal Institute for Population Research claimed in 2015 the percentage for women with an age of at least 35 giving birth to a child was 25.9%.
In Europe, the average childbearing age has been rising continuously for some time. In Western, Northern, and Southern Europe, first-time mothers are on average 26 to 29 years old, up from 23 to 25 years at the start of the 1970s. In a number of European countries (Spain), the mean age of women at first childbirth has crossed the 30-year threshold.
Stages in prenatal development, with weeks and months numbered from last menstruation In humans, the usual definition of preterm birth is birth before a gestational age of 37 complete weeks. [ 94 ] In the normal human fetus, several organ systems mature between 34 and 37 weeks, and the fetus reaches adequate maturity by the end of this period.
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Infant death refers to the death of a child before their first birthday or within 12 months of life. Some of the main causes include premature birth, SIDS, low birth weight, malnutrition and infectious diseases. And lastly, the under-5 mortality rate refers to children who die under the age of 5 years old or within the first 5 years of life. [10]
If breastfeeding is the infant's only source of nutrition and the baby is less than 6 months old, 93–99% of women are estimated to have protection from becoming pregnant in the first six months (0.75–7.5% failure rate). [112] [113] The failure rate increases to 4–7% at one year and 13% at two years. [114]
The average breastfed baby doubles its birth weight in 5–6 months. By one year, a typical breastfed baby weighs about 2 + 1 ⁄ 2 times its birth weight. At one year, breastfed babies tend to be leaner than formula-fed babies, which improves long-run health. [191]
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