She bit me really hard when I was holding her. I said, quite sharply, you don't bite mummy and shifted my hold. She gave me a big grin and bit me again. So I said it again and put her down and went away a few feet. She just came straight back and climbed up me. I'm not getting through to her that I'm cross with her at all. I don't really want to upset her but is there a way to get it through to her that this is wrong or is she just too young to understand?