Thanks useful information: 
Stacewyllie, can you try different settings whilst they're asleep? My two boys slept whilst the room was lit, all be it not full sunlight, but that adds to the challenge and also your knowledge of the triangle of settings. This may be a good start, try AV or TV modes first, with these modes, set ISO to auto. See what works, and then read the EXIF data, as it will give you a good start for next time. If in TV mode, the longer the shutter duration the more chance of shake, so ISO is critical with aperture.
Have fun and experiment.
P.S If you want to buy a specific lens, try thedigitalpicture and look under reviews, them you can look at all the Prime lenses and decide what will work for you. Great source of Canon information.
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