Pregnant women exposed to pollen may cause asthma in babies

　　Scientists have discovered a link to allergies asthma Linked to changes in the immune system, a Swedish study suggests that environmental factors such as pollen may even have an impact on prenatal life. fetus It has the same effect.

　　Researchers looked at 111,702 people who were conceived and born in the Stockholm area between 1988 and 1995. baby Research was conducted. They followed the babies for a year after birth and found that 923 babies were hospitalized for asthma. Comparing babies with asthma from childhood to normal babies, it is clear that the mother's lack of exposure to pollen during the last 12 weeks of pregnancy has a significant impact.

　　Because pollen levels vary during different months of the year, the researchers didn't specifically look at how month of birth affects a baby's chance of developing asthma, but they said it could be a factor. A pregnant woman's exposure to pollen appears to be more important than the month the baby is born.

　　After the original study, researchers followed the children through their second year of life and came to similar conclusions. Asthma in childhood may also be related to other factors, such as length of pregnancy, maternal and Postpartum The baby’s contact with other allergens, etc.