You have four choices:
You can welcome children with open arms
You can decide to have an “adults only” wedding
You can include immediate family only; or,
You can hire a child care service to provide day care either at the reception space, in a hotel room or at a family member’s home.
To prevent hurt feelings, it’s wise to avoid allowing some families to bring children while excluding others (unless, of course, the children are in your bridal party).