I could use some information about how to apply for disability benefits for a child.
Of course. You should review the Child Disability Starter Kit. This kit answers common questions about applying for Supplemental Security Income SSI benefits for children, and includes a worksheet that will help you gather the information you need.
Did you contact Social Security to find out whether the income and resources of the parents and the child are within the allowed limits, and to start the SSI application process?
Yes, I talked to them.