I thought at 15 months that it might be a bit young to discipline a child for them to really understand what they are doing is wrong anyway. Of course I tell my son no when he is not suppose to be touching something and while is seems like he sort of understands that what he is doing he shouldn't be he still continues to do it!
I get the feeling that my mother in law thinks he should stop doing things right away when you say no the first time (she has raised 4 boys)
for example he loves touching the television and she says no to him but he keeps doing it then she starts to get a bit agitated with him
when do they really understand what they are doing they shouldn't be?
melissa, vic, Patrick 2.5 & Laura 15 months