Each 1099-DIV should have the child's Social Security number on it. You do not report the child's income on your tax return. You should give the 1099-DIV forms to the children's parents. If the dividends that you mentioned are the child's only income, the child does not have to file a tax return. But if they have other income or file a tax return for any reason, the child or the parents will need the 1099-DIV. As the children get older it will become important that they and their parents know about the UTMA accounts and get the 1099 forms.
