Infants born to women following lifestyle advice were significantly less likely to have birth weight above @ kg ( @ % versus @ % ; adjusted risk ratio ( aRR ) = @ ; @ % confidence interval ( CI ) @ to @ ; P = @ ) , or respiratory distress syndrome ( @ % versus @ % ; aRR = @ ; @ % CI @ to @ ; P = @ ) , particularly moderate or severe disease , and had a shorter length of postnatal hospital stay ( @ days versus @ days ; adjusted ratio of means @ ; @ % CI @ to @ ; P = @ ) compared with infants born to women who received Standard Care .