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ObjectiveTo examine the birth and health outcomes of children migrating with parents internationally and domestically, and to identify whether the healthy migration effect exist in migrant children.MethodsFive electronic databases were searched for cross-sectional, case-control, or cohort studies published from January 1, 2000 to January 30, 2021and written by English language, reporting the risk of health outcomes of migrant children (e.g., birth outcome, nutrition, physical health, mental health, death, and substance use) We excluded studies in which participants' age more than 18 years, or participants were forced migration due to armed conflict or disasters, or when the comparators were not native-born residents. Pooled odd ratio (OR) was calculated using random-effects models.ResultsOur research identified 10,404 records, of which 98 studies were retrained for analysis. The majority of the included studies (89, 91%) focused on international migration and 9 (9%) on migration within country. Compared with native children, migrant children had increased risks of malnutrition [OR 1.26 (95% CI 1.11–1.44)], poor physical health [OR 1.34 (95% CI 1.11–1.61)], mental disorder [OR 1.24 (95% CI 1.00–1.52)], and death [OR 1.11 (95% CI 1.01–1.21)], while had a lower risk of adverse birth outcome [OR 0.92 (95% CI 0.87–0.97)]. The difference of substance use risk was not found between the two groups.ConclusionMigrant children had increased risk of adverse health outcomes. No obvious evidence was observed regarding healthy migration effect among migrant children. Actions are required to address the health inequity among these populations.Systematic Review Registrationhttps://www.crd.york.ac.uk/prospero/#myprospero, identifier: CRD42021214115.

Moisture becomes problematic in underground civil air defence work because of heavy rusting of protection equipment, mould and construction deterioration. This study conducted long-term measurement of the heat and humidity environment in a residential and a non-residential underground civil air defence work in Beijing. The thermal environment was very stable at a good level except in some summer days in the non-residential civil air defence work because of moisture insulation in summer and straw board interior wall furnishing, whereas it was very severe and varied with changing outdoor conditions in the residential civil air defence work. The humidity environment in the residential civil air defence work was wet or very wet (RH > 80%) for over 20% of the year, which may cause mould growth and surface condensation, because of low indoor temperature in winter and occupant activities and natural ventilation in summer. The findings of this study may prove important in elucidating the formation mechanism of thermal environment in civil air defence work and to develop appropriate desiccant solutions.

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ObjectivesThis study aimed to understand the early development and nurturing care environment of children aged 0–6 years in rural China and to evaluate the sex‐ and age‐specific associations of nurturing care environment with child developmental outcomes.MethodsA cross‐sectional survey involving 2078 children aged 0–6 years was conducted using a stratified cluster sampling strategy. We used face‐to‐face interviews to collect information on child, family and nurturing care. The Ages & Stages Questionnaires‐Chinese version and ASQ: Social‐Emotional were applied to assess children's neuro‐ and social–emotional development, respectively. Lower neurodevelopmental scores indicate an increased risk for neurodevelopmental delay, and higher social–emotional scores are indicative to a risk of social–emotional problems. The multiple linear regression model examined the associations of nurturing care environments with childhood development.ResultsAmong the investigated children, the average age was (42.9 ± 19.8) months and 55.8% were boys; 67.9% of the children had absent fathers because of labour migration and 54.0% had limited access to books and toys. Overall, boys had a lower total neurodevelopmental score than girls; similar gender patterns were also found in the domains of communication, fine motor, problem‐solving and person‐social. Concurrent absent fathers and limited access to books and toys were significantly associated with reduced neurodevelopmental scores [β − 11.44, 95% CI (−18.20, −4.68)] and increased social–emotional developmental scores [β 5.88, 95%CI (1.35, 10.41)] after controlling for confounding factors. Sex‐specific analysis only echoed the results in boys. Additionally, having an absent father and limited access to books and toys was associated with lower neurodevelopmental scores [β − 14.58, 95%CI (−25.41, −3.75)] in children under 3 years of age and higher social–emotional developmental scores among children aged 3–6 years [β 10.66, 95%CI (5.09, 16.24)].ConclusionsChildren, especially boys, with absent fathers due to labour migration have poorer neuro‐ and social–emotional development. Limited access to books and toys and father absence are linked to the children's developmental delay, especially for those under 3 years of age. Our findings suggest that intervention programs in resource‐constrained rural areas are desirable; more importantly, such programs should begin before 3 years of age to achieve a benefit–cost outcome.