Methods	Study design: Quasi‐experimental study
	Unit of randomization: Not randomised
	Type of study: BEP
Participants	Location/setting: Slum district of Bogota, Colombia.
	Population: Not specified
	Sample size: 443
	Drop outs/withdrawal: Not specified
	Socio‐demographics
	Mean (SD) age:
	Intervention:
	Boys 25.9 (5.6)
	Girls 25.8 (5.1)
	Control:
	Boys 25.5 (5.8)
	Girls 26.9 (5.8)
	Occupation: Not specified
	Race: Latin American
	Education:
	Mothers education (year of school‐mean)
	Boys:
	Supplemented: 2.9
	Unsupplemented: 2.9
	Girls:
	Supplemented: 25.8
	Unsupplemented: 26.9
	Family income: (in pesos)
	Boys:
	Supplemented: 1357
	Unsupplemented: 1486
	Girls:
	Supplemented: 1452
	Unsupplemented: 1372
	Inclusion criteria:
	Women in first‐ or second‐trimester of pregnancy. Women were selected from a poor community and had at least 50% of previous children whose weight‐for‐height < 85% of Colombian standard
	Exclusion criteria: Not specified
Interventions	Intervention (sample size):
	Supplement: 60 g dried skim milk, 150 g enriched bread, and 20 g vegetable oil (Total energy: 856 kcal) (n = 221)
	Control (sample size): No intervention (n = 222)
	Concomitant interventions:
	Both groups were given free medical care for mothers and children under the age of seven. This involved prenatal, postnatal obstetrical services, attendance during delivery, emergency admission to hospital, continuing paediatric services and prescribed medications
	Trainings: Not specified
	Follow up: No follow‐up
Outcomes	Outcome:
	Stillbirths
	SGA
	Birth weigt
	Preterm birth
	Timing of outcome assessment: 15 days of pregnancy and developmental outcomes at birth
Notes	Study start date: Not specified
	Study end date: Not specified
	Time period: Not specified
	Study country: Colombia
	Study limitations: Not specified
	Funding source:
	National Institutes of Child Health and Human Development Grant R01‐HD06774; the Ford Foundation Grant 740‐0348; The German Research Foundation; and the Fund for Research and Teaching, Department of Nutrition, Harvard School of Public Health. The authors acknowledge the invaluable contribution of Nelly Mora, Esther Mantilla and Marilu Fuentes in collection of the data, and also thank Vera Kardonsky for her comments on the draft of the paper
	Conflict of interest: Not specified