[Psychomotor efficiency in children of low socioeconomic status, during their 2d year of life].
D000367:Age Factors; D002657:Child Development; D002677:Chile; D003430:Cross-Sectional Studies; D006801:Humans; D007223:Infant; D009048:Motor Skills; D011581:Psychological Tests; D012959:Socioeconomic Factors
Rendimiento psicomotor en niños de nivel socioeconómico bajo, durante su segundo año de vida.