Nearly 4 percent of pregnant women in the United States use illicit drugs such as marijuana, cocaine, ecstasy and other amphetamines, and heroin. These and other illicit drugs may pose various risks for pregnant women and their babies. Some of these drugs can cause a baby to be born too small or too soon, or to have withdrawal symptoms, birth defects of learning and behavioral problems. Some studies suggest that use of marijuana during pregnancy may slow fetal growth and slightly decrease the length of pregnancy. These effects are seen mainly in women who use marijuana regularly.
Smoking marijuana increases the level on carbon monoxide and carbon dioxide in the blood, which reduces the oxygen supply to the unborn baby. Smoking marijuana during pregnancy can increase the chances of miscarriage, low birth weight, premature births, developmental delays, and behavioral and learning problems.
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