NB: Changing job is normal, especially in the early years of work (three changes before thirty, they say). But not changing for changes sake - you need sound reasons - like wanting to broaden your experience, earn better money or gain promotion - not to escape from what has turned out to be less to your liking after a short time particularly.
Before you go you should assess the experience you've gained from the job and establish how far it goes to matching the knowledge and expertise in the next job you want.
If there is a gap, what can you do here-and-now to address it?
Have you discussed your development needs with your employer? Consider that staying a little longer and seeking the necessary knowledge / skill by way of in-house training / additional experience might help.
Research the 'wider' employment market and what is happening out there.
Understand the changes that have occurred in the modern working environment eg. outsourcing, globalisation, movement from hierarchical to flatter structures. Recognise realities like the existence of fewer traditional graduate jobs, the rise in importance of employment in SMEs and generally the ongoing need to be open to change.
are all options you might care to look at, at this stage.
Develop your own career action plan by reviewing your own skills, knowledge, constraints and values. Consider also the entry requirements and skills required in the new career area sought.
If you have satisfied yourself that the right match exists between you and the career area, you can start to develop an action plan detailing the actions you need to take in order to enter that career. This will inlcude updating your CV and improving your networking and interviewing skills.
More information at careers4graduates.org.
Ask yourself: what is missing in your current career?
This could include a need for more responsibility or autonomy, scope to use your specialist skills, travel, work-life balance, work conditions etc. These are all factors you need to consider, including the extent to which they are presenting as 'push' or 'pull' factors in your decision-making.
Importantly, you need to review your skills portfolio. A typical checklist for you to review yourself includes:
Improve / gain what you require through in-house training, short courses or distance learning.
Research the skills you need for career change from job advertisements, professional bodies and company literature.