Not entirely sure what the role encompasses but I assume you can answer any technical ability questions and give examples of success in the past.
Also behavioural questions around communication skills, planning and organising, prioritising, deadlines, working under pressure, motivation, dealing with/overcoming difficult situations, working in a team.
Have three key strengths prepared and a 'weakness' or area for improvement
If (hopefully not as they shoudn't really) they ask about children ages or child care, just say you are reluctant to answer. If asked why, say its a well known fact that women with young children are the most discriminated group in the work place and anyway you want to focus on your skills and ability to do the job.
Make sure you have a list of good, well prepared questions for them at the end. I have been so disappointed in the past when interviewing candidates and they don't have any questions at the end. It can make all the difference when choosing between 2/3 people. Good questions show you have made an effort and put some thougth into it and are really interested.
Finally, do some homework so you know a bit about the organisation beforehand and make sure you make some small talk with the people/person you meet upon arrival. Often even the receptionist or person taking you to the interview room can be asked for feedback and if you are the only one who has made a decent conversation you will be remembered for that.