I know this is a silly question, but I am new to the chicken world. A few of my most friendly hens, oddly, sometimes peck a little bit more aggressively that it startles my hand. They are only about 3 1/2 weeks old, so I am concerned as they get bigger, will this become a problem if I want to hand feed them or is there something I can do to train them out of that? I'm more concerned for my 2 year old's sake than anything....