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.
Piaget's stage theory describes the cognitive development of children. Cognitive development involves changes in cognitive process and abilities. In Piaget's view, early cognitive development involves processes based upon actions and later progresses to changes in mental operations. A Look at Piaget's Stages of Cognitive Development. Through his observations of his children, Piaget developed a stage theory of intellectual development that included four distinct stages: The Sensorimotor Stage Ages: Birth to 2 Years Major Characteristics and Developmental Changes: 1  The infant knows the world through their movements and sensations. 2  Children learn about the world through basic actions such as sucking, grasping, looking, and listening. 3  Infants learn that things continue to exist even though they cannot be seen (object permanence).