Thanks for the responses guys, it is good to know that others feel the same.

Hehe, took her to the chiro today who told me that she's a "grumpy wee thing". Ha, well I'd be grumpy too if you poked and prodded me too when I have no idea what you're doing to me!!

What I mean by the cognitive ability part is that she isn't able to make the link between her behaviour and reaction. Ok, they do cute things to make us laugh and copy us but they are unable to actually realise at this point in their development that that is what they are doing. (I've been reading way too much "Science of Parenting" book, can you tell?) Missy loves making us giggle but she also makes me tear out my hair!

Thanks again guys,
Sue x