Stunting is a problem of high prevalence in underveloped and developing counties. In Chile, 30% of 6 years old children are small for their age, which increases to 63% at 13 years. The objective of this papers was to study cognitive development and psychoeducation abilities of low SEL school age children. 163 school children, both sexes, 7 to 19 years old, and birth weight>=2800 grs were selected. They had no genetic or neurological, and attended schools in the outskirts of Santiago. 103 were stunted (height for age <= 95%, weight for height > 95% and < 120%), and 60 had normal height (NH)(height for age >= 97%; weight for height > 95% and < 120%; 50th centile NCHS). 4 study groups were prepared, according to the history of malnutrition and/or infections: during their first 6 years of life(records of the outpatients clinics, National Health0: Stunted without history of malnutrition and/or infection: 53, Stunted with history: 50; NH without history: 34; NH with history: 26. Results suggest that stunted and non stunted children reach, average intellectual performances (WISC-R). Nevertheless, proportion of children with Verbal and Total IQ lower than 90 is significantly higher in the stunted group. Differences are also observed in psycholingüistic abilities (ITPA), reading comprehension (CLP) and maths skills (Benton-Luria), with lower scores for stunted children. Within stunted group, children wiht history of undemourishment and infections show lower scores in psycholingüistic abilities when compared with children without that history. Results suggest an association effect between linear growth retardation and lower cognitive performance. It is not possible to establish a causal effect, specially considering that stunted children come from poorer families. (Funded by FONDECYT, project 1051/91)