BMJ Open, 13(1):e062562. BMJ Publishing Group Cavallera, V, Lancaster, G, Gladstone, M, Black, M M, McCray, G, Nizar, A, Ahmed, S, Dutta, A, Anago, R K E, Brentani, A, Jiang, F, Sch?nbeck, Y, McCoy, D C, Kariger, P, Weber, A M, Raikes, A, Waldman, M, van Buuren, S, Kaur, R, P?rez Maillard, M, Nisar, M I, Khanam, R, Sazawal, S, Zongo, A, Pacifico Mercadante, M, Zhang, Y, Roy, A D, Hepworth, K, Fink, G N, Rubio-Codina, M, Tofail, F, Eekhout, I, Seiden, J, Norton, R, Baqui, A H, Khalfan Ali, J, Zhao, J, Holzinger, A, Detmar, S, Kembou, S N, Begum, F, Mohammed Ali, S, Jehan, F, Dua, T & Janus, M 2023, ' Protocol for validation of the Global Scales for Early Development (GSED) for children under 3 years of age in seven countries ', BMJ Open, vol. 13, no. 1, e062562 . https://doi.org/10.1136/bmjopen-2022-062562