Is it considered rude to invite children, but not babies (say, under 2 or 3) to the wedding? Specifically, would it be rude to invite my cousins' kids that are older, and not invite my cousins' kids that are just infants? My mom brought this possibility up for a variety of reasons. Part of me agrees with my mom on this, but the other part of me feels bad limiting this. I would appreciate some honest etiquette advice!