How should I stop a 6month baby yelling? Scared she hurt her throat. She used to be a lovely baby and keep smiling to everyone. But I found these days she are less smiling but keep yelling..

She probably want to speak like mom and dad too :) try to converse with her whenever she is yelling, and later she'll get the idea how to communicate properly instead of yelling. Example if she yells because she wants her toy, acknowledge her need and phrase it: 'ohh, you want your doll, isn't it? Say please, dear.' Smile while doing this. Obviously she cannot repeat it yet but what mstters is she's observing and learning by example.