Pollen allergies increase the risk of asthma in infants High exposure to pollen in the last three months of pregnancy significantly increases the risk of serious asthma. A study conducted in Sweden analyzed data from more than 110,000 cases of pregnancy. The researchers found that exposure to high pollen is associated with a 35 percent increased risk of the baby developing asthma. Pollen can be found on grass, trees and flowers. In a country with four seasons, the highest pollen exposure usually occurs in late spring into early fall. “Women who are sensitive to pollen during pregnancy have increased risk of asthma, premature, and impaired fetal growth,” said a research team led by Dr Adrian Lowe, from Umea University, as reported by the Daily Mail. Now, researchers are developing advanced studies related to the effects of pollen exposure on the immune system of the fetus. Primarily a severe respiratory disease in infants early in life.