They note that the 1950's and 60's were a period of affluence, and the family was supported by the father's income alone. The Social-emotional development of a child is affected by kinds of interaction and exchange attributable to both genetic predisposition and environmental factors.
Children use fewer generalizations, categories, or principles.
They also tend to base their understanding of the world on particular examples, tangible sensations, and material objects. Children expand their language acquisition through reading and writing skills. The proportions of their body change, and all rapid physical changes slow down to a more steady development through which children acquire and perfect motor skills. The systems, procedures, technology and products of society and culture which impact upon the home, community, school, and professional spheres set parameters and impact upon exchange and learning. Demographic changes in society, with changes in lifestyles, create new patterns and procedures, dissolve patterns and complexes, determine anew the opportunities and constraints.