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There is very little compelling evidence that household size negatively affects child development. In this study, the effects of household size on child development were analysed using data collected for a sample of 1311 four-year-old Jamaican children. Children's development was assessed using the Griffiths Mental Development Scales across six developmental domains: locomotor, personal-social, language, coordination, performance and practical reasoning. The findings suggest that children's locomotor and personal-social development are negatively affected by household crowding, with no significant effects observed for other domains. Additional results show that these adverse effects are strongest if the child lives in a single room compared to a separately detached house. This evidence speaks to the need to tailor policies towards access to good housing infrastructure and the provision of recreational spaces to encourage play and social interaction among children.
Reynolds-Salmon et al. (Tue,) studied this question.