The early stages of orthodontic treatment are the leveling/alignment phases. What this means, is that general lining up of teeth and alleviation of crowding is occurring. As the braces and wires move the teeth, often little spaces will develop between teeth as they are being pushed and moved around one another. This is completely normal!
Some space does need to be created for teeth to have space to move. I remember being a patient myself and wondering why I suddenly had a huge gap between my teeth! Once I realized that this was a normal part of the process, I could see that eventually the spaces closed and things looked great. So, if you see spacing developing do not worry! But, as always, if you have any questions about treatment please do not hesitate to ask your orthodontist.