Infants will be randomly assigned to a study group or control group. The research study will last for approximately twenty four months. Infants will have daily assessments while in the hospital and three study visits after hospital discharge. All post-discharge visits will occur in an out patient hospital setting. During the first days of life, study staff will start observing infant's development by using assessment tools. Lab samples include one blood sample taken when other blood is being collected in the first days of life and one saliva sample when the infants starts bottle feeding.