We estimated the relationship between cumulative exclusive breast-feeding up to @ months and wheezing , rash and body mass index ( BMI ) at @ months -LSB- in the Whistler cohort ( n = @ ) and PROBIT ( n = @,@ ) -RSB- , and wheezing , rash , asthma , hay fever , eczema , allergy and BMI at age @ years ( PROBIT ) .