If asthmatic mother get inhaled corticosteroids has fewer or no attacs, better oxygienisation. But the absorbed fraction has effect on her baby. We treat pregnant asthmatic women with budesonide based on safety dates. Has this fraction lungselectivity in embryos too? Can it facilitat the maturation of airways? Have somebody dates? Are there any differents between budesonide, cycloserin, BDP and fluticasone -P/F ?