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A fetal heartbeat can be detected at around 17 to 20 weeks of gestation when the chambers of the heart have become sufficiently developed. [20] During childbirth, the parameter is part of cardiotocography, which is where the fetal heartbeat and uterine contractions are continuously recorded.
The warnings state that "smoking while pregnant can reduce the weight of your baby." Instead of heeding the warning, some teens are pursuing this as a way to deliberately have a smaller baby.
Smoking during pregnancy can result in lower birth weight as well as deformities in the fetus. [18] [19] Smoking nearly doubles the risk of low birthweight babies. In 2004, 11.9% of babies born to smokers had low birthweight as compared to only 7.2% of babies born to nonsmokers.
Tobacco smoking during pregnancy can cause a wide range of behavioral, neurological, and physical difficulties. [112] Smoking during pregnancy causes twice the risk of premature rupture of membranes, placental abruption and placenta previa. [113] Smoking is associated with 30% higher odds of preterm birth. [114]
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Smoking most commonly leads to diseases affecting the heart and lungs and will commonly affect areas such as hands or feet. First signs of smoking-related health issues often show up as numbness in the extremities, with smoking being a major risk factor for heart attacks, chronic obstructive pulmonary disease (COPD), emphysema, and cancer, particularly lung cancer, cancers of the larynx and ...
A 2015 review concluded that "Nicotine acts as a gateway drug on the brain, and this effect is likely to occur whether the exposure is from smoking tobacco, passive tobacco smoke or e-cigarettes." [25] Nicotine may have a profound impact on sleep. [26] The effects on sleep vary after being intoxicated, during withdrawal, and from long-term use ...
The deaths were likely due to birth defects or genetic problems not compatible with life, the pregnancies of which would typically have been terminated by abortion, according to researchers.