A toy that absorbs water and can expand to 400 times its original size has been voluntarily recalled after a report that a baby ingested one and needed surgery to remove it, the Consumer Product Safety Commission said Monday. The CPSC said the marble-size toy can be swallowed, and once inside the stomach, it can expand and cause blockage in the small intestine. The toys do not show up on an x-ray and require surgery to be removed, according to the commission.