Conclusion:  Our finding that combined pill use before pregnancy was not related to respiratory outcomes should provide reassurance to the vast majority of mothers using OCPs before becoming pregnant. The small association with progestin‐only pill use and early respiratory outcomes may reflect uncontrolled confounding or other bias. Nonetheless, it does suggest that these two types of pills should be examined separately in future analyses of respiratory and other childhood outcomes.

Source: Pediatric Allergy and Immunology
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