A six-year-old boy allegedly thrown from the tenth floor of the Tate Modern suffered a bleed on the brain and fractures to his spine, legs and arms, a court has heard.
The child, who is a French national, was visiting London with his family when he plummeted five storeys and landed on the art gallery's fifth floor roof.
He is now in stable but critical condition after being air lifted to hospital by London's Air Ambulance.
The 17-year-old charged with his attempted murder appeared before Bromley Youth Court today.
The teenager - who cannot be named for legal reasons - wore a grey jumper and spoke to confirm his name, address, date of birth and nationality as British at the short court hearing.
Scotland Yard has said there was no link between the suspect and the victim.
Olga Malehevska was on the viewing platform with her four-year-old son when the incident took place and described what happened as "absolutely terrifying".
Officers were called to the gallery at around 2.40pm on Sunday, and the child was treated at the scene.
Visitors to the gallery at the time of the incident took to social media to repor that they were not allowed in or out of the space while the emergency services dealt with the incident.
The Tate Modern was the UK's most popular tourist attraction in 2018 after being visited 5.9 million times, according to the Association of Leading Visitor Attractions.