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[4] [5] This is just over nine months. Counting by fertilization age, the length is about 38 weeks. [5] [13] Pregnancy is "the presence of an implanted human embryo or fetus in the uterus"; implantation occurs on average 8–9 days after fertilization. [15]
Intrauterine growth restriction ( IUGR ), or fetal growth restriction, is the poor growth of a fetus while in the womb during pregnancy. IUGR is defined by clinical features of malnutrition and evidence of reduced growth regardless of an infant's birth weight percentile. [ 5] The causes of IUGR are broad and may involve maternal, fetal, or ...
Preterm birth, also known as premature birth, is the birth of a baby at fewer than 37 weeks gestational age, as opposed to full-term delivery at approximately 40 weeks. [ 1] Extreme preterm [ 2] is less than 28 weeks, very early preterm birth is between 28 and 32 weeks, early preterm birth occurs between 32 and 34 weeks, late preterm birth is ...
The fetal origins hypothesis (differentiated from the Developmental Origins of Health and Disease hypothesis, which emphasizes environmental conditions both before and immediately after birth) proposes that the period of gestation has significant impacts on the developmental health and wellbeing outcomes for an individual ranging from infancy ...
[20] [21] The abortion rate has continuously declined from a peak in 1980 of 30 per 1,000 women of childbearing age (15–44) to 11.3 by 2018. [22] In 2018, 78% of abortions were performed at 9 weeks or less gestation, and 92% of abortions were performed at 13 weeks or less gestation. [22]
3% of newborns (US) [ 8] Deaths. 628,000 (2015) [ 9] A birth defect[ a] is an abnormal condition that is present at birth, regardless of its cause. [ 2] Birth defects may result in disabilities that may be physical, intellectual, or developmental. [ 2] The disabilities can range from mild to severe. [ 6]
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