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The human brain experiences intensive connectivity and size transformations after birth.1 Head circumference (HC) shows important increments in size, specifically in the first year; then, this growth rate decelerates over time.2 Identifying the different elements required for proper physical growth in children during critical periods is relevant for primary health care. The regression coefficients ( ) and their 95% confidence intervals (95% CIs) were calculated by multiple linear regression, to assess the independent associations with HC z-score values at the follow-up visit. After multiple adjustments, there were number of variables that were positive predictors of the HC z-score in the first year of life, in addition to the child's age, primiparity, type of delivery and birthweight. [Extracted from the article]