DD1 is 4 years old and often shouts as she talks. I hold up my hand to tell her to be quiet and in a soft tone tell her to speak properly and lower her voice. This usually works for 2 minutes and then she'll start again and repeat the process.
Lately when she's frustrated she'll give a high pitched shriek. I've repeated the above steps, explained to her why nobody likes screaming, sent her on the naughty step and it still happens daily.
It's got to the point where once every two days I just end up shouting "STOP BLOODY SCREECHING!" which doesn't help.
Any advice? It could be with anything from having to share a toy to the dog being in her way or her dad singing her a song. Anything that she doesn't like is just met with a screech and a "No, STOP IT!"