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Environmental toxicants and fetal development is the impact of different toxic substances from the environment on the development of the fetus.This article deals with potential adverse effects of environmental toxicants on the prenatal development of both the embryo or fetus, as well as pregnancy complications.
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.
The amniotic sac, also called the bag of waters [1] [2] or the membranes, [3] is the sac in which the embryo and later fetus develops in amniotes.It is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth.
Preterm births (births taking place before 37 weeks) can be the result of a number of causes such as, in utero infection, inflammation, vascular disease and uterine overdistension. [16] The risk of spontaneous preterm birth is increased by a previous preterm birth, black race, periodontal diseases and low maternal body-mass index .
A woman's breasts grow during pregnancy, typically 1 to 2 cup sizes. [10] A woman who wore a C cup bra prior to her pregnancy may need to buy an F cup or larger bra while nursing. [11] A woman's torso also grows and her bra band size may increase one or two sizes. [12]
A fetus or foetus (/ ˈ f iː t ə s /; pl.: fetuses, foetuses, rarely feti or foeti) is the unborn mammalian offspring that develops from an embryo. [1] Following the embryonic stage, the fetal stage of development takes place.