The items you'll need when applying for a child's benefits are basically the same things you need when applying for any social security claim. However, you're also likely to need the child's birth certificate or other such documents. If you're seeking disability benefits for a child, you'll have to produce medical evidence of their disability. These items might include a complete list of medical personnel who treated the child, and the dates of treatment; copies of their medical records; names of any prescription drugs they are taking; and test results. For a child to receive dependents benefits, you must show that they are under 18, or in high school full time and under age 19. If applying for the child's survivor benefits, their parent's death certificate or other proof will be required, in addition to basic information like the child's social security number, proof of age, and address. For more information on child's benefits, ask social security for the booklets 'S-S-I,' and 'Benefits for Children with Disabilities.