Young children in a new situation with and without their mothers.
D000367:Age Factors; D000704:Analysis of Variance; D002652:Child Behavior; D002674:Child, Institutionalized; D002675:Child, Preschool; D004777:Environment; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D009034:Mother-Child Relations; D009068:Movement; D010988:Play and Playthings; D012932:Social Facilitation; D012934:Social Isolation; D013060:Speech; D014705:Verbal Behavior