L.K.
What an awesome idea, Tara!
K., my son will be a year old in 16 days and he did the same thing for a while. As soon as he discovered screaming, he LOVED IT and did it quite frequently. lol However, maybe because he's still figuring out what all he's capable of or something, he moved on to other noises after a while. He still does it occasionally, but generally when he's really excited or happy. I wouldn't worry too much about it, but if you are, try Tara's advice! Best of luck to you! : )