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This study aimed to determine whether lactobacilli and other microbes are reduced in the gut of infants born to an asthmatic mother, and whether this differs by the sex of the infant.<\/jats:p><jats:p>Mother-infant pairs (N=1021) from the Canadian Healthy Infant Longitudinal Development full-term cohort were studied. The abundance of infant faecal microbiota at 3\u20134\u2005months, profiled by gene sequencing, was compared between both women with and without asthma treatment during pregnancy. Infant sex, maternal ethnicity, pre-pregnancy overweight and atopy status, birth mode, breastfeeding status and intrapartum antibiotic treatment were tested as covariates.<\/jats:p><jats:p>Independent of birth mode and other covariates, male, Caucasian infants born to women with prenatal asthma harboured fewer lactobacilli in the gut at 3\u20134\u2005months of age. If asthmatic mothers had pre-pregnancy overweight, the abundance of<jats:italic>Lactobacillus<\/jats:italic>in males was further reduced in the infant gut, whereas the microbiota of female infants was enriched with<jats:italic>Bacteroidaceae<\/jats:italic>. Similar differences in infant gut microbial composition according to maternal prenatal asthma status were also more evident among women with food or environmental allergies.<\/jats:p><jats:p>Gut lactobacilli were less abundant in male infants, but<jats:italic>Bacteroidaceae<\/jats:italic>were more abundant in female infants at 3\u20134\u2005months of age, following maternal asthma during pregnancy.<\/jats:p>","DOI":"10.1183\/13993003.00280-2017","type":"journal-article","created":{"date-parts":[[2017,11,27]],"date-time":"2017-11-27T14:48:21Z","timestamp":1511794101000},"page":"1700280","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":25,"title":["Sex-specific impact of asthma during pregnancy on infant gut microbiota"],"prefix":"10.1183","volume":"50","author":[{"given":"Petya T.","family":"Koleva","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hein 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