Competing interests: We declare the following interests based on NICE's policy on conflicts of interests (available at www.nice.org.uk/Media/Default/About/Who-we-are/Policies-and-procedures/code-of-practice-for-declaring-and-managing-conflicts-of-interest.pdf): RP received payments to present a BMJ Mastercourses webinar on common problems in newborns and infants and a webinar on feeding problems in infants, and to conduct teaching with BMJ Learning.