I think the best advice is that "Mummy knows best" (i.e. basically what everyone else has said, that YOU know what is best for YOUR baby and that you should trust your instincts).

The worst advice still makes my blood boil. It was something along the lines of dipping a dummy in whisky when your baby cries!!! WTF is THAT about?!?! And I was given this advice when Jacob was a matter of days old.........seriously!!!!