yeah, some parents are quite okay when it comes to raising kids in terms of letting them fall or knock their head cos they feel that's how the kid can grow up stronger (esp boys). However, if too young, the skull is not hard enuf and the brain is still developing so we as parents must be mindful lar..
Juz, if ur house is not child safe, then u better hv tat yard thing so that ur baby can play inside thr.. at least when u r not watching, u will not worry