However, there is no secret formula for writing a blogbuster.

FORBES: Connect

"If you're going to write to a formula of some kind the writing is dead, which we know by having seen it so often, " Lessing says.

CNN: Uncovering the secrets of storytelling

"There's a dichotomy of 'good mothers breast feed, bad mothers formula feed', " says journalist Madeleine Morris, who is writing a book about the topic.

BBC: Formula v breastfeeding: Should the state step in?