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A human fetus, attached to placenta, at three months gestational age. In humans, the fetal stage starts nine weeks after fertilization. [7] At this time the fetus is typically about 30 millimetres (1 + 1 ⁄ 4 in) in length from crown to rump, and weighs about 8 grams. [7] The head makes up nearly half of the size of the fetus. [8]
A newly developing human is typically referred to as an embryo until the ninth week after conception, when it is then referred to as a fetus. In other multicellular organisms, the word "embryo" can be used more broadly to any early developmental or life cycle stage prior to birth or hatching.
At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs. Human embryology is the study of this development during the first eight weeks after fertilization.
The Arizona Supreme Court on Wednesday ruled a fetus can be referred to as an "unborn human being" in pamphlets for voters to decide about the constitutional right to an abortion. Voters in the ...
The fetus reaches a length of about 40–48 cm (16–19 in). The fetus weighs about 2.5 to 3 kg (6 lb 10 oz)to 6 lb 12 oz). Lanugo begins to disappear. Body fat increases. Fingernails reach the end of the fingertips. A baby born at 36 weeks has a high chance of survival, but may require medical interventions. Fetus at 38 weeks after fertilization.
A fetus born prior to the 37th week of gestation is considered to be preterm. A preterm baby is likely to be premature and consequently faces increased risk of morbidity and mortality. An estimated due date is given by Naegele's rule. According to the WHO, a preterm birth is defined as "babies born alive before 37 weeks of pregnancy are completed."
Add definition 2a from source [1] and definition 2 from source [2] to the sentence "In the biological sciences, a child is usually defined as a person between birth and puberty..." The current entry is incomplete because it excludes definitions listed in the two sources provided. Definition 2a from source [1]: 2.a. An unborn infant; a fetus.
The born alive rule is a common law legal principle that holds that various criminal laws, such as homicide and assault, apply only to a child that is "born alive".U.S. courts have overturned this rule, citing recent advances in science and medicine, and in several states feticide statutes have been explicitly framed or amended to include fetuses in utero.