I have a nine month old and I've come to the conclusion that I can't easily influence his behaviour at this age.
Like others including VioletSmile have said, one parent can try a sleeping method for example with one child and feel proud when they have success, this will lead them to think that it is the method and their parenting skills which have changed the behaviour ... and this will be partly true.
However, another parent can try just as hard with the same method and have no success at all.
Is it the method that is wrong? Is the second parent just not as good at following the advice? Or is it down to the baby and their innate temperament?
When I tried the controlled crying technique on my DS he was so upset within 5 minutes that he had gone purple and made himself sick. I am NEVER doing that again. Another friend had a sleep through baby after one attempt.
I have had problems with weaning too ... and before any of you with easy babies wonder, I use all my own homemade organic food, make meal time as fun as possible and reward him with all manner of high jinx when he eats any of his dinner at all.
Maybe when he is older I will be able to influence his behaviour ... but at the moment I have to accept that he will take the lead.