I'm aware this probably sounds ridiculous. DD 6 months has a cousin who is 4 months. Like I imagine most parents of similar-aged babies/children do, DSis and I often sit them together and encourage them to interact. However since DD has been sitting up unaided and moving around more and has become more proficient at grabbing, she won't let her cousin touch anything without snatching it from him, even if she wasnt interested in it before he picked it up. She also kicks off if he's being fed and she isn't, and even sometimes if she is being fed at the same time!
Is this normal? I expected this kind of thing a few years from now, but not at 6 months! I'm not sure how to deal with it. Obviously I can't really discipline her at her age, and although I do move her away when she's grabbing at toys, she then gets upset and I feel bad because surely she doesn't understand! Any ideas?