Mr. Screechy

My youngest child is 10 months old. Because he is 10 months old, his powers of conversation have not quite developed yet. Oh he can say Dada and bah bah bah bah and every once in a blue moon he'll spout off with a Mama! His favourite noise though seems to be the screech. And not like a normal baby squeal. No, this boy lets loose an ear drum rattling, glass shattering honest to goodness shrill screech. He does it most often when he's in his exersaucer. I'm starting to think he doesn't like it in there. But then I look back at him and he's as happy as can be...screeching away like a Ring Wraith.