I am a very frequent on-demand BFing, cosleeping mum to DD who is nearly 6 months; she needs the boob to fall asleep, wakes a lot in the night but is quick to feed back to sleep and is generally very happy. Depending on my mood, I find myself swinging from being mildly content with how things are going to terrified that I am 'ruining' my child and making the proverbial rod by giving her bad habits. So...at what age, roughly, do habits form? And is there a general time after which it is much harder to change them, or is this completely child/habit dependent?