When you are photographing children, that means sitting or kneeling. Shooting quickly There are several ways to shoot pictures more quickly, and thus less obtrusively. Practice with your camera is the most important one. As you become more familiar with the controls, their use becomes more automatic. Whenever you come into a situation where you want to take photos, you can pre-set your exposure.
Most locations are relatively uniformly lit.
A meter reading for one part of a room will be the same in most of that room. Near windows and doors or in dark corners will be exceptions. If you have set the exposure for the room, when you want to take a photo, all you will need to do is focus, frame the shot, and shoot. It is faster if you don't have to determine exposure, too. Remember to advance the film before you want to take a photo.