Systematic reviews suggest that breastfeeding is associated with a lower risk of asthma, although marked heterogeneity exists. Using UK Millennium Cohort Study data (n = 10,126 children born 2000-2001), we examined the association between breastfeeding duration and wheezing in the past year, first at each age-group separately (age 9 months, 3, 5, 7 and 11 years) and then as a longitudinal wheezing phenotype: ‘early transient’ (wheezing any time up to age 5 but not thereafter); ‘late onset’ (a...Expand abstract
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