1. Similarities and differences in child development from birth to age 3 years by sex and across four countries: a cross-sectional, observational study 
Prof Ilgi Ozturk Ertem, MD, Vibha Krishnamurthy, MD, Mphelekedzeni C Mulaudzi, MD, Yanina Sguassero, MD, Hakan Balta, MD, Ozlem Gulumser, MD, Burcu Bilik, MSc, Roopa Srinivasan, MD, Benjamin Johnson, MSc, Geliang Gan, PhD, Lisa Calvocoressi, PhD, Veronika Shabanova, PhD, Prof Brian W C Forsyth, MBChB 
The Lancet Global Health 
Volume 6, Issue 3, Pages e279-e291 (March 2018)
DOI: /S X(18)
Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license Terms and Conditions

2. Figure 1
Distribution of ages of attainment for selected developmental milestones across sexes and the total sample
The Lancet Global Health 2018 6, e279-e291DOI: ( /S X(18) )
Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license Terms and Conditions

3. Figure 2
Distribution of ages of attainment for selected developmental milestones across Argentina, Turkey, India, and South Africa, and the total sample
The Lancet Global Health 2018 6, e279-e291DOI: ( /S X(18) )
Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license Terms and Conditions