Mehmet Koc, 13, lies on a treatment bed as he waits to be seen at the Royal National Orthopaedic Hospital for a prosthetics fitting in London, Britain, October 9, 2023. Mehmet has received prosthetic legs, and in the hospital, he practises taking steps and doing exercises to build strength. The legs however are a struggle to get used to, they take time to fit correctly, and as he grows they will need to be frequently adjusted. He may also face more surgery. Doctors estimate it requires 300 percent more energy to walk across a flat surface with bilateral above-knee prosthetics than natural walking, and for children, it is particularly hard. REUTERS/Clodagh Kilcoyne