Is it ok to let baby to fall down for them to learn? Will it hurt their brain? As I don't wish my kids too protective also. My baby 8months now. I bought a thick carpet for her (2inch). She always unaware and fall behind while sitting.

falling down in a safe position and with rightful protection should be fine but of course not too often as we will never know what can result in frequent falls with their little bones & muscles.. especially their neck and head which i personally find its the most fragile..