In this work author investigate ex-premature neurological development characteristics in the first childhooh and expose the results of a longitudinal search that estimate the development of the following behavioral characterisitics: vigilance and interactive ability, irritability and tears, consolability and spleeping organisation an their influence on affective and relational development.Authors conclude stressing on imporrtance to give parents all informations about these developmental charactgerisitcs to aid comunication between parents and children