It is ettiquette....but From what I have read you are allowed to take pictures of children without consent.Just depends of what and where. Photographers display images in thier shops and at other public displays without consent. Cindy put in a thread here a bit back with a PDF on photography do's and don'ts A good read. Congrats..best of luck.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."