This updated guideline was coordinated by Mr Gerardo Zamora and Dr Lisa Rogers, under the supervision of Dr Juan Pablo Peña-Rosas. Thanks are due to Dr Susan Norris and staff from the World Health Organization (WHO) Guidelines Review Committee Secretariat for their support throughout the process and to Ms Alma Alic from the Office of Compliance and Risk Management and Ethics for her support in the management of conflicts of interest procedures. Thanks are also due to the office of the Deputy Minister for the Prevention and Promotion of Health, Ministry of Health, Mexico, for their support in the preparation of one of the consultative meetings where this guideline was discussed. WHO acknowledges the technical contribution from the following individuals (in alphabetical order): Ms Mónica Flores-Urrutia, Dr Jonathan Siekmann and Dr Pattanee Winichagoon. Ms Jennifer Volonnino from the Evidence and Programme Guidance Unit, Department of Nutrition for Health and Development, provided logistic support.

WHO gratefully acknowledges the technical input of the members of the Nutrition Steering Committee and the WHO guidelines development group – nutrition actions 2013–2014, especially the chairs of the meetings, Dr Rebecca Stoltzfus and Ms Rusidah Selamat. WHO is also grateful to the staff of the Cochrane Pregnancy and Childbirth Group, for their support during the development of the systematic review used to inform this updated guideline.