Mother-infant interactions in the first year.
D000367:Age Factors; D002652:Child Behavior; D002657:Child Development; D002674:Child, Institutionalized; D003431:Cross-Cultural Comparison; D002658:Developmental Disabilities; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009034:Mother-Child Relations; D009679:Nuclear Family; D012934:Social Isolation; D012959:Socioeconomic Factors