Table 1.

Details of study data collection instruments

Variable	Method	Baseline	Monthly	Effectiveness phase (12 months)	Extended implementation (24 months)	Study personnel	Comments
Sociodemographic data	Basic health history and demographics survey	X				Study nurse	Online supplemental file 1
Development (primary outcome)	Bayley Scales of Infant Development, Version 340	X		X	X	Study psychologist or paediatrician	Commercial instrument
Home environment (secondary outcome)	Home Observation for Measurement of the Environment13	X		X	X	Study nurse	Commercial instrument
Anthropometrics	Weight (kg), length (cm)	X		X	X	Study nurse	WHO Growth Standards will be used to convert to z-scores41
Diet quality	Minimum dietary diversity, minimum meal frequency and minimum acceptable diet	X		X	X	Study nurse	WHO Infant and Young Child Feeding indicators42
Haemoglobin	Hemocue Hb 201+	X		X	X	Study nurse	Using manufacturer’s protocol
Focus groups/interviews with stakeholders	Focus groups and interview guides to be developed in year 1 of the project	X		X	X	Qualitative research staff	Instruments under development during first 1 year of project
Cost to caregivers/families	Survey		X			Frontline workers	Instruments under development during first 1 year of project
Cost to frontline workers	Survey		X			Research coordinator	Instruments under development during first 1 year of project
Costs to health system	Survey		X			Research coordinator	Instruments under development during first 1 year of project