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Newcomers are often healthy when they arrive in Canada, yet experience health declines shortly thereafter, possibly due to lifestyle changes. As part of the Healthy Immigrant Children study, this mixed-methods study aims to analyze possible predictors of physical activity among 300 newcomer children, and explore their lived experiences using a sub-sample of 19 parents and 24 service providers. Data collection involved questionnaires concerning socioeconomic status and physical activity, anthropometric measurements, and in-depth interviews. Participants aged 5 years and older largely met physical activity recommendations (82.9%), while none of the 3-4-year-olds did. Males were more active than females, especially among older ages. Many participants engaged in too much screen time (53.4-90.0%). Age and income predicted physical activity among males, while parents' education level was the only significant predictor among females. Barriers to physical activity included: recreational physical activity being an unfamiliar concept, gender limitations, financial resources, safety concerns, and children's preference for screen time. Schools played a central role in newcomer children's health by providing accessible opportunities for physical activity. Newcomer families preferred to have their children involved in culturally relevant physical activities. Given the growing newcomer population, it is important to support active lifestyle practices among them. Novelty: About 83% of newcomer children aged 5 years and older met physical activity recommendations, while none of the 3-4-year-olds did. Age and income predicted males' physical activity, while parents' education level predicted females' physical activity. Schools provide accessible opportunities for newcomer children to engage in physical activity.

Adequate calcium intake and supply of vitamin D during childhood play important roles in ensuring adequate bone mass gain to achieve optimal peak bone mass. The Healthy Immigrant Children study employed a mixed-method cross-sectional study design to characterize the health and nutritional status of 300 immigrant and refugee children aged 3-13 years who had been in Canada for less than 5 years. This paper presents bone mineral content and vitamin D status data along with qualitative data that deepen the understanding of newcomer bone health status. A significantly higher percentage of refugee children (72.3%) had insufficient (<50 nmol/L) or deficient (<30 nmol/L) serum vitamin D compared with immigrants (53.2%). Vitamin D deficiency was most common among ethnic minority girls. Newcomer children with higher intakes of vitamin D, younger newcomer children, and those from western Europe or the United States had higher serum vitamin D levels. Immigrants had significantly higher mean total body bone mineral content compared with refugees. Total body fat, serum vitamin D, calcium intake, height, height by calcium intake, total body fat by calcium intake, and total body fat by height predicted total body bone mineral content levels. Vitamin D deficiency among newcomer children may be related to lack of knowledge regarding children's vitamin D requirements in the Canadian environment, dietary habits established in country of origin, low income that limits healthy dietary choices, and lifestyle habits that limit exposure to sunlight. Results suggest a need to screen newcomer children and pregnant women for vitamin D deficiency and support early intervention.

There are knowledge gaps in our understanding of the development of chronic disease risks in children, especially with regard to the risk differentials experienced by immigrants and refugees. The Healthy Immigrant Children study employed a mixed-methods cross-sectional study design to characterize the health and nutritional status of 300 immigrant and refugee children aged 3-13 years who had been in Canada for less than 5 years. Quantitative data regarding socioeconomic status, food security, physical activity, diet, and bone and body composition and anthropometric measurements were collected. Qualitative data regarding their experiences with accessing health care and their family lifestyle habits were gathered through in-depth interviews with the parents of newcomer children. Many newcomers spoke about their struggles to attain their desired standard of living. Regarding health outcomes, significantly more refugees (23%) had stunted growth when compared with immigrants (5%). Older children, those with better-educated parents, and those who consumed a poorer-quality diet were at a higher risk of being overweight or obese. Sixty percent of refugees and 42% of immigrants had high blood cholesterol. Significant health concerns for refugee children include stunting and high blood cholesterol levels, and emerging trends indicate that older immigrant children from privileged backgrounds in low-income countries may be more at risk of overweight and obesity. A variety of pathways related to their families' conceptualization of life in Canada and the social structures that limit progress to meeting their goals likely influence the development of health inequity among refugee and immigrant children. Public health initiatives should address these health inequities among newcomer families.