I agree with Mumofsix - It is so different when they are your own.
Other peoples kids often drive me up the wall. I have one friend who has 3 boys, I dont mind her littlest one but her middle one I want to throttle! Last time they were over he swung on my clothesline, continually got toys out of the cupboard when I'd said no more out, is a bit of a thug etc - but with your own you raise them the way you want them to behave - with your values.
It is so different - and you grow with your baby, each new milestone is precious.

Children are made tiny, helpless, precious with big heads and large eyes for a reason - so we do fall in love with them (so by the time they start their 'phases' and do things like talk back, get attitudes etc - we are all ready in love with them) otherwise they wouldnt make it!