Some amazing photos by Stephanie Sinclair:

Tahani – in pink – married her husband Majed when she was 6 and he was 25; poses with her former classmate Ghada, also a child bride. Nearly half of all women in Yemen were married as children. Photo by Stephanie Sinclair
(source)

Child marriage in Afghanistan. Ghulam Haider, 11, is to be married to Faiz Mohammed, 40. She had hoped to be a teacher but was forced to quit her classes when she became engaged. Photo by Stephanie Sinclair/The New York Times
(source)

Roshan Qasem, 11, will join the household of Said Mohammed, 55; his first wife; their three sons; and their daughter, who is the same age as Roshan. Photo by Stephanie Sinclair
(source)

Delhi, India. Kishore (13) and his new wife Maya (8), inside their home. Photo by Stephanie Sinclair
(source)
More on child marriage here. Some data are here. And more here about the human rights implications.