Thoroughly describe and give at least 1 example of physical one example of physical developments in the first two years of life are motor skills. motor skills are the skills most parents eagerly await in their newborn. there are multiple dramatic changes that occur during this time frame, from barely being able to lift their head to being able to walk and navigate independently (feldman, 2017) (chapter 4), cognitive cognitive development during the first 2 years of life can be explained with piaget's six substages of the sensorimotor stage. the six stages are: simple reflexes, first habits and primary circular reactions, coordination of secondary circular reactions, tertiary circular reactions, and lastly the beginnings of thought. the first stage happens during the first month of life, the simple relaxes. this period has the various reflexes that teach the baby how to react with the world, which form the cognitive center of life. (feldman, 2017) (chapter 5) and social and personality social and personality development during the first 2 years of life is the development of stranger anxiety. this development happens during the middle half of the first year that cause infants to be scared/weary of strangers. it is caused because infants cognitive abilities have increased so they are able to recognize people they know and those that they don't know. (feldman, 2017) (chapter 6) development during the first 2 years of life development during the first 2 years of life is their rapid growth. infants grow rapidly over the first two years. by 5 months old most babies have doubled their birth weight. then by their first! birthday they have tripled their birth weight. although their growth does slow by the time, they are two years old, most infants are four times their birth weight. (feldman, 2017) feldman, robert s. (2017). development across the life span sth ed, boston, ma: pearson publishers