The British hospital treating a terminally ill baby on Friday said it would examine claims of new evidence that he could be treated after US President Donald Trump and Pope Francis drew international attention to the case.

"Two international hospitals and their researchers have communicated to us as late as the last 24 hours that they have fresh evidence about their proposed experimental treatment," Great Ormond Street Hospital for Children said in a statement, referring to the case of Charlie Gard.

"We believe, in common with Charlie's parents, it is right to explore this evidence," it said.