regarding this topic, yes and no will be my answer as well.

i agree the saying that nowadays those kids are being watched closely (can be said as tightly) by their parents - strict hygiene code. this is bad as the kids will develop a weaker immune system when they are exposed to those harmful environment.

but the problem is that we can't compare nowadays with the era of our old generation. nowadays, the population getting really really bad and out of control. everywhere is extremely polluted which even do harm to those older generation that used to play in so-called-dirty-nowadays environment.