Abstract Objective To analyze the factors associated with children's linear growth, according to the different subsystems of the 6Cs model and Bronfenbrenner's Bioecological Theory. Data sources Narrative review, carried out in the Scielo, Lilacs, Pubmed, and Science Direct databases, based on research using the terms Bioecological Theory, child growth, and risk factors, combined with the use of Boolean operators. Summary of findings According to the 6Cs model, proposed based on Bronfenbrenner's Bioecological Theory, the determining factors of children's linear growth are in six interrelated subsystems - cell, child, clan, community, country/state and culture. The empirical studies included in this review made it possible to analyze protection and risk factors within the subsystems. Among the protective factors: are adequate birth weight and satisfactory weight gain, breastfeeding for six months or more; proper hygienic habit of hand washing, proper elimination of feces, and access to clean water. As risk factors: low, birth weight and size, prematurity, multiple deliveries, short interval between deliveries, non-exclusive breastfeeding until the 3rd month, frequency and severity of infectious processes and anemia, little parental education, short maternal statur, inadequate maternal nutritional status, domestic violence, family poverty, food, and nutritional insecurity, living in rural areas or at high altitudes. Conclusion Children's linear growth is determined by interrelated factors that encompass aspects prior to the child's birth, as well as socioeconomic, political, family and community issues.

Resumo Objetivos: avaliar a eficácia do sururu (Mytella falcata) na recuperação de crianças desnutridas. Métodos: foram acompanhadas por 12 meses 64 crianças desnutridas crônicas atendidas no Centro Recuperação e Educação Nutricional. As crianças foram pareadas por idade e grau de desnutrição formando 3 grupos, os quais receberam dieta balanceada para a recuperação nutricional diferindo apenas na fonte de proteína. Foi ofertada ao grupo (1) preparação de carne bovina, ao grupo (2) preparação de sururu e ao grupo (3) uma preparação de sururu com leite de coco. Resultados: a avaliação antropométrica revelou que as crianças obtiveram um incremento médio em escore Z no índice A-I de 0,70 para o grupo da carne, 0,62 no grupo que recebeu sururu e 0,57 no grupo que recebeu sururu com leite de coco (pD0,05). Constatou-se ainda redução da prevalência da anemia nos grupos com percentual de redução de 22,8% (p=0,002), 27,8% (p=0,007) e 42,4% (pD0,001) nos grupos 1, 2 e 3, respectivamente. Conclusões: a preparação sururu com ou sem leite de coco pode ser um substituto eficaz da carne bovina no combate a desnutrição infantil e da anemia, podendo ser incluída no cardápio de instituições infantis e em programas que visem à recuperação nutricional de crianças.

Abstract Objectives: to assess the efficacy of mussels (Mytella falcata) in malnourished children’s recovery. Methods: 64 chronically malnourished children were accompanied for 12 months and attended at the Centro Recuperação e Educação Nutricional (Recovery Center and Educational Nutrition). The children were paired by age and malnutrition level forming three groups, which they received a balanced diet for nutritional recovery differing only on protein source. The group was offered (1) preparation of red meat, group (2) preparation of mussels and group (3) preparation of mussels in coconut milk. Results: the anthropometric assessment revealed that the children obtained a mean increase in the Z score in A-I indice of 0.70 for the group who red meat, 0.62 for the group who had mussels and 0.57 the group who had mussels cooked in coconut milk (p<0,05). An observation was made on a reduction in the prevalence of anemia with 22,8% (p=0,002), 27.8% (p=0.,007) and 42.4% (p 0.001) in groups 1, 2 and 3, respectively. Conclusion: the preparation of mussels cooked in or not in coconut milk can be an effective substitution for meat in combating child malnutrition and anemia and may be included in the children's institutions menus and in the programs that aim for children’s nutritional recovery.