Millions of Americans with disabilities have gained innumerable rights and opportunities since Congress passed landmark legislation on their behalf in 1990. And yet advocates say barriers and bias still abound when it comes to one basic human right: To be a parent.

A Kansas City, Mo., couple had their daughter taken into custody by the state two days after her birth because both parents were blind. A Chicago mother, because she is quadriplegic, endured an 18-month legal battle to keep custody of her young son. A California woman paid an advance fee to an adoption agency, then was told she might be unfit to adopt because she has cerebral palsy.

Such cases are found nationwide, according to a new report by the National Council on Disability, an independent federal agency. The 445-page document is viewed by the disability-rights community as by far the most comprehensive ever on the topic — simultaneously an encyclopedic accounting of the status quo and an emotional plea for change.