Study	Reason for exclusion
Agustina 2013	Participants: children aged 1–6 years. We could not exclude the ≥ 5 years old from the analysis.
Akeredolu 2014	Sample representative of urban area but not necessarily poor or slum area. In the text: 2 general hospitals (representing Urban and Rural areas in Lagos state) were selected. No email address for author. Based on information, excluded as not representative of poor urban area.
Choudhury 2016	Study design did not meet the review PICO criteria.
Effendy 2015	Outcomes are WFA and WFH. Height not measured. Study did not meet the review inclusion PICO criteria.
Iannotti 2013	Conference abstract. Contacted author. Primary outcomes were not included. Study did not meet the review inclusion PICO criteria.
Kikafunda 1998	Unclear from the text if the location was an urban slum. We contacted the author but received no response.
Krebs 2011	Not an intervention but a cross‐sectional study.
Kæstel 2005	Unclear from the text if the location was an urban slum. We contacted the author but received no response.
Mitter 2012	Children's age did not meet the review PICO inclusion criteria.
Poudel 2004	Study design did not meet the review PICO criteria.
Saran 2002	Study design did not meet the review PICO criteria.
Semba 2011	Not an intervention but a cross‐sectional study.
Soofi 2013	Cluster urban and rural were used for sampling but were not used for the analysis.
Tomlinson 2016	Children aged 0–6 years old. We could not exclude the ≥ 5 years from the analysis.

PICO: Population, Intervention, Comparison and Outcome; WFA: weight‐for‐age; WFH: weight‐for‐height.