Why winter is not suitable for pregnancy

　　Indoor pollution is more serious in winter and can easily cause fetus defect.

　　The first three months of pregnancy is a critical period for the differentiation and formation of important organs such as the heart, brain, liver, and kidneys of the fetus. If the early pregnancy occurs in winter, due to severe indoor air pollution, the relative risk of the fetus having defects is significantly higher than in other seasons.

　　A new Canadian study also found that children born to pregnant women who worked in these chemical environments performed worse than normal children on tests of language skills, attention and memory.

　　Expert research results show that indoor and outdoor air pollution is significantly related to early embryonic teratogenesis. Sulfur dioxide in the air can cause genetic and chromosomal abnormalities in human cells, leading to fetal malformations. The concentration of sulfur dioxide in the air in winter is higher than in other seasons, especially in industrial cities. Therefore, the birth defects of fetuses pregnant in winter are significantly higher than those in other seasons. The birth defect rate is 7.9%, and the birth defect rate in summer is 5%-5.8%.

　　After pregnancy, spring comes. The humidity in the air is high and the temperature gradually rises, which is conducive to the reproduction and growth of various viruses, making the virus more disease Significantly increases and often causes epidemics. In addition, the weather in spring is changeable and it is easy to catch cold, so pregnant women are more likely to be infected with the virus.