She's been this way for months but it's getting worse. She pulls everyone's hair but the main problem has been her pulling her (same-age) cousin's hair CONSTANTLY at every play date. It's just a giant hair-pulling prevention get together time. It's absurd. We just redirect and redirect and I'm about to lose it. If I turn my back for two seconds she pulls like crazy and he cries and cries. 
Are 9 month olds too little to understand "no"? Help, I don't know what I'm doing! She doesn't appear to be angry or jealous when she's doing this. She just looks like she has a major compulsion to pull hair.
Thanks for any advice,

Are 9 month olds too little to understand "no"? Help, I don't know what I'm doing! She doesn't appear to be angry or jealous when she's doing this. She just looks like she has a major compulsion to pull hair.
Thanks for any advice,









