Barnen med på fotografering?
I feel it is really nice to have the babies and children in the photos. They are the heart of the family, and the day of the wedding is also their celebration. When they are really little, it is sweet and cute to have them in the images. When they are a little older, I think there is also something else: toddlers might feel somehow excluded from the center of the attention, that day. And being a bit jealous, too! So, I would really give them all the importance. Wedding with children is not between two people, but between three (or four, or five!).
But of course, everyone should do as they feel it is right for them!