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.

Babies head is fragile so i dont think its a good idea to let the baby fall to learn especially if she is falling behind while sitting. You never know how hard is the impact of the fall and how much baby can take it. Better be safe than sorry.. thats my take.