My dd is only 10 mnths old so I don't know what to do. She is not distressed when she does it, it just seems to be a new noise she has discovered she can make. It would be ok if it wasn't so eardrum piercing. She did it all the way round the supermarket the other day and I spent the whole time apologising to people for her. I ended up coming home without half of the shopping.When she does it I give her a stern "no", but she doesn't understand no yet, she just smiles and screams again. Any ideas that may salvage our eardrums?