Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "The randomization scheme and coded supplement packets were prepared by a team in Baltimore, none of whom was involved in recruitment or follow‐up of infants in Indonesia"
		Comment: Most likely done
Allocation concealment (selection bias)	Low risk	Quote: "Supplements were individually coded, odorless, and identical in appearance"
		Comment: Most likely done
Blinding of participants and personnel (performance bias)	Low risk	Quote: "The randomization scheme and coded supplement packets were prepared by a team in Baltimore, none of whom was involved in recruitment or follow‐up of infants in Indonesia
		Comment: Most likely done
Blinding of outcome assessment (detection bias)	Low risk	Quote:: "Two study pediatricians, masked to the treatment group of the case, independently reviewed each verbal autopsy and assigned as a probable cause of death all diagnoses for which the criteria of the algorithm were met"
		Comment: Most likely done
Incomplete outcome data (attrition bias)	Unclear risk	Total number of loss to follow up: n (%)
		The loss to follow up was balanced
Selective reporting (reporting bias)	Low risk	Authors seem to report all the relevant outcomes
Other bias	Low risk	No other risk of bias was noted