MMR vaccine. The MMR vaccine contains vaccines that protect against three viral infections: measles, mumps and rubella. It is given as a series of two doses at 12 to 15 months of age and at 4 to 6 years of age.ubella is a viral infection also known as German measles. Rubella infection of children causes a mild rash on the face, swelling of glands behind the ear, occasionally a short-lived swelling of small joints (like the joints of the hand), and low-grade fever.
Key Concepts. Eriksonâs psychosocial theory of development considers the impact of external factors, parents and society on personality development from childhood to adulthood. According to Eriksonâs theory, every person must pass through a series of eight interrelated stages over the entire life cycle[2]. Basic Trust vs. Mistrust â Hope.
Stage theories typically focus on âage-appropriateâ developmental tasks to be achieved at each stage. Erik Erikson and Carl Jung proposed stage theories of human development that encompass the entire life span, and emphasized the potential for positive change very late in life.hanges occur at the cellular level and are partially explained by biological theories of adult development and aging. Biological changes influence psychological and interpersonal/social developmental changes, which are often described by stage theories of human development.