Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "Sectors were listed in geographically contiguous order and were randomized in blocks of 4 within each of 3 previously randomized maternal supplementation trial treatment arms…"
		Comment: Most likely done
Allocation concealment (selection bias)	Unclear risk	Quote: "Community maps of the area were developed, homes were issued numeric addresses, and married women of reproductive age were enumerated and issued unique study identification numbers"
		Comment: Most likely done
Blinding of participants and personnel (performance bias)	Low risk	Quote: "The supplements for both groups were opaque gelatinous capsules identical in shape, size, and color containing edible oil"
		Comment: Most likely done
Blinding of outcome assessment (detection bias)	Unclear risk	Quote: "Infant vital status was assessed weekly at home for the first 12 weeks of life by field staff and then again at 24 weeks of age"
		Comment: Most likely done
Incomplete outcome data (attrition bias)	Low risk	Total number of loss to follow up: 11 (0.07%)
		The loss to follow up was not 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