Duijts 2010.

Methods	Prospective, population‐based pregnancy/birth cohort study (Generation R Study from Rotterdam.)
Participants	1095 healthy Dutch singleton infants.
Interventions	EBF = BF without other milk or solids until 6 months (n = 58). MBF = introduction of milk and/or solids between 4 and 6 months with continuation of partial BF until 6 months (n = 1037).
Outcomes	1 or more episodes of upper respiratory tract, lower respiratory tract, and gastrointestinal tract infection in first 6 months and from 7‐12 months.
Notes	1. Outcomes based on mailed questionnaires (maternal report) sent at 6 and 12 months postpartum. 2. Of 7893 total infants enrolled in the cohort, breastfeeding, outcome, and covariate (potential confounder) data were available in only ˜3500 (44%) at 6 months and ˜3000 (38%) at 12 months.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	D ‐ Not done