I have a 15 month old who shrieks a very high pitched squeal constantly throughout the day...just for fun and to hear his own voice. Then often the other kids copy him. The older kids know they are not allowed to scream in the house, but the one year olds don't understand. It grates on my nerves so much that I feel like screaming myself by the end of the day! Does anyone have tips for a child this age to stop them from shrieking for fun?