Gard and his family have been at the center of an worldwide debate over whether governments can make life and death decisions for individuals.
Charlie Gard with his parents.
At his worst point, Olga said their son was "lying in a hospital bed and the most he could do sometimes was move his head just a little bit ... he couldn't even shed tears".
Multiple members of Congress have sought ways to bring Charlie to the United States for treatment, including Rep. Hospital officials have been trying to gain permission from a court to cut Charlie's life support, and a court granted that permission in June, according to CNN.
Dr Michio Hirano, a neuroscientist from Columbia University in NY, is said to have spent over five hours trying to convince doctors, along with an expert from a Vatican hospital in Rome.
British specialists have said treatment will not work, and the infant's life support should be turned off.
However, Dr. Michio Hirano, MD, a Harvard-trained neurologist, examined Charlie this week to provide his opinion about experimental treatment. "We are not bad parents, we are there for him all the time, we are completely devoted to him and he's not in pain and suffering, and I promise everyone I would not sit there and watch my son in pain and suffering, I couldn't do it".
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Only when "sufficient progress" has been made on those matters will the European Union allow discussions to turn to trade. Barnier said on Monday that the talks, which run to Thursday, would "delve into the heart of the matter".
Mr Justice Francis has considered the couple's latest claims at preliminary hearings in the Family Division of the High Court in London.
Charlie's mother, Connie Yates, is also attending, alongside an independent chairman.
But Dr Hirano, 55, believes his experimental theory could give Charlie "11% to 56% chance of clinically meaningful improvement".
Last Friday, in the latest hearing over the 11-month-old's future, Mr Justice Francis made it clear it would be illegal for Charlie to travel to the U.S. without his permission.
Hirano traveled to London to examine Charlie and meet with his doctors and other members of the medical team on Monday and Tuesday.
The hospital said it would admit Charlie "provided that arrangements are made to safely transfer [Charlie] to our facility, legal hurdles are cleared, and we receive emergency approval from the US Food and Drug Administration (FDA) for an experimental treatment as appropriate".
Charlie's parents have been in a four-month legal battle over their rights as parents to determine the type of treatments their son can have.
"Being able to hear the heartbeat ... we had this gut feeling of there has to be something - I mean, a doctor may say it, but she's moving".