Normally it is understandable that you do not stay a long time on your first job. However if you change often after the second or third job, then nobody wants to hire a job hopper. I saw a worst Resume who changes job every 3 - 6 month and who learns a lot of different quick courses ( in Finance Major). Just from the resume you feel that she does not know what she wants to do in life, and you do not know whether she left the job or she was fired. Normally people expects you to stay with 1 job for at least 2 years.