A small amount of occasional smoking by a pregnant woman will have little effect on the fetus, while frequent and large amounts of smoking may lead to poor fetal development and delayed brain development.
1. Little effect: pregnant women only occasionally smoke a small amount of cigarettes, usually no exposure to second-hand smoke, the impact on the fetus is relatively small.
2. Fetal dysplasia: frequent smoking during pregnancy, cigarettes have more harmful substances, such as nicotine, carbon monoxide, tar, etc. These harmful substances enter the human body and produce a series of chemical reactions in the bloodstream that have an impact on the fetus.
The placenta is the only channel for transporting nutrients, and these harmful substances through the placenta may lead to intrauterine oxygen deprivation, and over time the fetus will suffer from intrauterine dysplasia, such as low-birth-weight babies, neural tube malformations, and cardiovascular diseases.
3. Delayed brain development: Frequent and large amounts of smoking during pregnancy may have a certain impact on the intelligence or psychology of the fetus after birth. Cyanide contained in cigarettes combines with sulfur amino acids in the body, leading to a decrease in the body’s content of vitamin B12, which may lead to mental retardation in newborns.
Smoking is not recommended during pregnancy, and prolonged smokers should do a good job of pregnancy checkups and find any abnormalities in time.