Between the ages of 3 and 8, children begin to widen their social network group, form relationships with their peers. By 3, a child has become more co-operative in their play, helped by their language development. For example, playing together with other children, sharing toys and taking turns in games. By the age of 7, most children have established a number of important friendships. Play is essential for communication skills and negotiating roles. By responding to their peers' feelings, children learn to be more co-operative in their play.