Yes it’s one of the most common causes of accidental death of children indoors…. Once a child stopped breathing after trauma to the head death would occur in about 5 minutes.
https://www.rospa.com/home-safety/advice/accidents-to-children
About 10 a year incuding those falling out of an upstairs window or downstairs. How often do cildren die from s fall inside s house and how long does death take to occur
Around 10 children die as a result of falls each year - some from windows and balconies and the remainder mostly from stairs. 2,4,10
Falls are by far the most common causes of accidents in the home; they account for 44 per cent of all children's accidents. 3
Most falls involve tripping over on the same level. However, the most serious consequences result from falls between two levels, such as falling out of a pram or highchair or falling from a bed. The worst injuries are sustained when a child falls from a great height or lands on something hard, sharp or hot.