Risks: Prone to metabolic abnormalities, leading to neural tube defects in embryonic development. Folic acid is a vital nutrient for fetal neural tube development, helping reduce the incidence of neural tube defects. However, for obese pregnant women, folic acid struggles to provide this protective effect. U.S. data indicates that women who are overweight before pregnancy have twice the risk of giving birth to a child with a neural tube defect compared to women of normal weight.while women who become overweight during pregnancy face a fourfold higher risk compared to those of normal weight.
Countermeasure: Begin adequate folic acid intake before conception by incorporating folate-rich foods such as animal liver or kidneys, leafy greens, fish, eggs, whole grains, and soy products. Additionally, take folic acid supplements starting 1-3 months before conception and continuing through the first trimester of pregnancy.
2. Pregnant women with dental caries or periodontitis
Risks: Increased likelihood of fetal infection leading to congenital heart disease, low birth weight, or preterm birth
Pregnant women with moderate to severe dental caries or periodontitis may have bacterial antibodies in their oral cavity. These antibodies can easily enter the placenta via the bloodstream, infecting the fetus and potentially causing congenital heart disease after birth.Furthermore, pregnant women with mild dental issues face a 6-8 times higher risk of delivering low-birth-weight infants. A U.S. study on preterm births revealed that most mothers of premature infants had bacterial antibodies in their mouths, whereas mothers of full-term babies did not exhibit this phenomenon. Pregnant women with periodontitis have a 7 times higher chance of preterm birth compared to healthy pregnant women.
Countermeasure: Pregnant women with periodontal disease should seek active treatment. Women planning pregnancy should undergo dental examinations before conception.
3. Iodine Deficiency During Pregnancy
Hazard: Impairs thyroid hormone synthesis, increasing fetal risk of cretinism
Iodine deficiency in pregnant women impairs thyroid hormone synthesis, preventing full differentiation of the cerebral cortex regions responsible for language, hearing, and intelligence during fetal development. This results in congenital cretinism, characterized by slow growth, sluggish responses, and distinctive facial features including a large head, depressed nasal bridge, protruding tongue, and drooling.In adulthood, this may manifest as short stature, deafness, mutism, or mental disorders. Currently, there is no specific treatment for cretinism.
Prevention: Ensure balanced nutrition during pregnancy, especially for women in iodine-deficient areas. Consume iodine-rich foods and use iodized salt consistently to meet the fetus's developmental needs.
4. Lack of Sunlight During Pregnancy
Risk: May adversely affect fetal brain development and increase the risk of future mental disorders
Insufficient outdoor exposure deprives the fetus of sunlight, potentially impairing brain development.
4. Insufficient Sun Exposure During Pregnancy
Risk: May adversely affect fetal brain development, increasing the likelihood of future mental disorders
Limited outdoor sunlight exposure during pregnancy can lead to vitamin D deficiency in the fetus during early development. This not only impacts bone formation but also negatively affects brain development.British medical scientists found that individuals born in spring in Europe and North America—whose mothers had limited sun exposure during pregnancy—exhibited a higher risk of schizophrenia following significant adult trauma.
Countermeasure: Pregnant women should regularly spend time outdoors in sunlight, especially those in colder regions or areas with frequent rain and fog.
5. Smoking During Pregnancy
Hazards: Increases risk of elevated blood pressure in newborns, leading to retinal lesions
Maternal smoking disrupts fetal blood circulation, causing polycythemia and chronic tissue hypoxia. This ultimately results in elevated blood pressure after birth, which may be a risk factor for neonatal retinal lesions.Research indicates that newborns of smoking mothers exhibit significantly higher rates of retinal artery stenosis and sclerosis, venous dilation and tortuosity, and retinal hemorrhage compared to those of non-smoking mothers.
Prevention: Pregnant women must strictly avoid cigarettes, including secondhand smoke.