International birth weight centiles

Boys
	Number of observations	Centiles for birth weight (kg)
	Number of observations	3rd	10th	50th	90th	97th
33 weeks	34	1.18	1.43	1.95	2.52	2.82
34 weeks	48	1.45	1.71	2.22	2.79	3.08
35 weeks	128	1.70	1.95	2.47	3.03	3.32
36 weeks	323	1.93	2.18	2.69	3.25	3.54
37 weeks	857	2.13	2.38	2.89	3.45	3.74
38 weeks	2045	2.32	2.57	3.07	3.63	3.92
39 weeks	3009	2.49	2.73	3.24	3.79	4.08
40 weeks	2568	2.63	2.88	3.38	3.94	4.22
41 weeks	1179	2.76	3.01	3.51	4.06	4.35
42 weeks	206	2.88	3.12	3.62	4.17	4.46
Total	10397	..	..	..	..	..

Girls
	Number of observations	Centiles for birth weight (kg)
	Number of observations	3rd	10th	50th	90th	97th
33 weeks	17	1.20	1.41	1.86	2.35	2.61
34 weeks	65	1.47	1.68	2.13	2.64	2.90
35 weeks	114	1.71	1.92	2.38	2.89	3.16
36 weeks	293	1.92	2.14	2.60	3.12	3.39
37 weeks	803	2.11	2.33	2.80	3.32	3.60
38 weeks	1802	2.28	2.50	2.97	3.51	3.78
39 weeks	2869	2.42	2.65	3.13	3.66	3.94
40 weeks	2523	2.55	2.78	3.26	3.80	4.08
41 weeks	1195	2.65	2.89	3.37	3.92	4.20
42 weeks	224	2.74	2.98	3.46	4.01	4.30
Total	9905	..	..	..	..	..

International standards for newborn weight by gestational age and sex from the Newborn Cross-Sectional Study of the INTERGROWTH-21st Project. Table shows smoothed centiles for birth weight of boys and girls according to exact gestational age.

kg: kilogram.

Reproduced from: Villar J, Cheikh Ismail L, Victoria CG, et al. International standards for newborn weight, length, and head circumference by gestational age and sex: the Newborn Cross-Sectional Study of the INTERGROWTH-21st Project. Lancet 2014; 384:857. Table used with the permission of Elsevier Inc. All rights reserved.

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