For a mother-to-be with allergic rhinitis, if she is in an acute attack of allergic rhinitis, there may be some effects on the fetus. If an acute attack of allergic rhinitis occurs, the mother-to-be will experience violent sneezing symptoms, which will lead to an increase in abdominal pressure and may cause the fetus to lack oxygen. If the mother-to-be has an attack of allergic rhinitis with very pronounced nasal congestion, she will experience symptoms of lack of oxygen during sleep at night, which may also affect the development of the fetus. If the mother-to-be has symptoms of allergic rhinitis, she can simply use saline or physiological seawater or nasal spray to cleanse her nasal passages when the symptoms are not obvious. If the symptoms of allergic rhinitis appear in the middle and later stages of pregnancy, you can consider using nasal sprays to reduce the local congestion and edema, thus alleviating the symptoms.