A photo of toddlers playing next to each other, which is called parallel play, and is typical of most kids around age two.
Photo (c) Zsolt Nyulaszi
Toddlers Playing Next to Each Other
Group play and sharing doesn't usually evolve until age three. Until then, most infants and younger toddlers simply play by themselves next to each other, in parallel play.
Sources:
Functional developmental evaluation. Prerequisite to habilitation. Capute AJ - Pediatr Clin North Am - 01-FEB-1973; 20(1): 3-26
Linguistic and auditory milestones during the first two years of life: a language inventory for the practitioner. Capute AJ - Clin Pediatr (Phila) - 01-NOV-1978; 17(11): 847-53
Clinical linguistic and auditory milestone scale: prediction of cognition in infancy. Capute AJ - Dev Med Child Neurol - 01-DEC-1986; 28(6): 762-71
The Denver Developmental Assessment (Denver II)
