[header] How to photograph a baptism [title] Choose a tone. [step] What are you hoping to get out of your baptism photography--a memento of the event, or a demonstration of your family's experience? The tone you want will determine how and when you take your photos. [substeps] Tone can include whether your photos are serious or relaxed, playful or solemn. 
The personality of the people being photographed will also come into play. Given that a baptism is a serious religious experience, you will likely need to have at least some serious photos.