हारियारि पछंथाननिफ्राइ सिगां खिदिया जोथोननि खुदिया देहा आरो सुबुङारि जौगानाय ( NICHD ) बिजिरनायनि बिथंनि सायाव , फ्राइयै 1 , 300 खुदियानि मोनसे लावथायारि बिजिरनाय ।
Based on data from the National Institute of Child Health and Human Development NICHD Study of Early Child Care a longitudinal study of approximately 1 300 children .