Shrieking Toddler!

My baby is a shrieker. Am I spelling that right? Anyway, he utters blood curdling screams all the time. He is 16 mos. I finally got him to do the sign for "please". I am so happy. I tried about at about 13 mos. He just didn't get it. I just have to share this to help the moms out there that might have a chronic shrieker. It has cut down on about a 1/3 of the shrieking. Gotta go he's shrieking to get out of his high chair.