Chris Gard and Connie Yates on Sunday delivered a petition to Great Ormond Street Hospital in London, where Charlie has remained on life support for months. The petition, which has more than 350,000 signatures, calls for Charlie to be transferred.

“He’s our son. He’s our flesh and blood. We feel it should be our right as parents to decide to give him a chance at life,” Yates told reporters Sunday, according to BBC. “There is nothing to lose. He deserves a chance.”…

“We believe, in common with Charlie’s parents, it is right to explore this evidence,” Great Ormond Street Hospital said in a statement Friday.