Birth Weight for Gestational Age

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Classification of growth for a particular gestational age is a critical part of fetal and infant care. References used at different centers are not always comparable, some are many years old and few have used rounding off to the nearest completed week of gestation as recommended by WHO. The Canadian Perinatal Surveillance System (CPSS) has developed this new population-based Canadian reference for birth weight for gestational age, which included data on all singleton infants born in Canada (with the exception of the province of Ontario) between 1994 and 1996 at 22 to 43 weeks gestation, comprising 347,570 males and 329,035 female infants. This reference was created during a period of increased availability of ultrasound confirmation of gestational age, and it is gender-specific.

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Birth Weight for Gestational Age (GA)

Birth Weight (in g) for GA in Completed Weeks
Canadian Male Singletons

GA	3%ile	5%ile	10%ile	50%ile	90%ile	95%ile	97%ile	Mean	SD
22	338	368	401	490	587	627	659	501	111
23	406	434	475	589	714	762	797	598	114
24	468	498	547	690	844	902	940	697	125
25	521	557	617	795	981	1,048	1,092	800	147
26	571	614	686	908	1,125	1,200	1,251	909	178
27	627	677	763	1,033	1,278	1,358	1,416	1,026	209
28	694	752	853	1,173	1,445	1,532	1,598	1,159	241
29	780	845	964	1,332	1,629	1,729	1,809	1,312	273
30	885	959	1,099	1,507	1,837	1,955	2,053	1,487	306
31	1,012	1,098	1,259	1,698	2,069	2,209	2,327	1,682	339
32	1,164	1,266	1,444	1,906	2,319	2,478	2,614	1,896	369
33	1,344	1,460	1,648	2,127	2,580	2,750	2,897	2,123	391
34	1,552	1,677	1,866	2,360	2,851	3,029	3,184	2,361	410
35	1,783	1,907	2,091	2,600	3,132	3,318	3,475	2,607	428
36	2,024	2,144	2,321	2,845	3,411	3,604	3,759	2,855	443
37	2,270	2,384	2,552	3,080	3,665	3,857	4,003	3,091	449
38	2,498	2,605	2,766	3,290	3,877	4,065	4,202	3,306	448
39	2,684	2,786	2,942	3,465	4,049	4,232	4,361	3,489	445
40	2,829	2,927	3,079	3,613	4,200	4,382	4,501	3,638	447
41	2,926	3,025	3,179	3,733	4,328	4,512	4,631	3,745	459
42	2,960	3,070	3,233	3,815	4,433	4,631	4,773	3,800	485
43	2,954	3,081	3,249	3,864	4,528	4,747	4,941	3,793	527

Source of Information:

Michael S. Kramer et al. A New and Improved Population-based Canadian Reference for Birth Weight for Gestational Age. Pediatrics, electronic version, August, 2001. http://www.pediatrics.org/cgi/content/full/108/2/e35

Birth Weight for Gestational Age (GA)

Birth Weight (in g) for GA in Completed Weeks
Canadian Female Singletons

GA	3%ile	5%ile	10%ile	50%ile	90%ile	95%ile	97%ile	Mean	SD
22	332	347	385	466	552	576	576	472	72
23	379	403	450	557	669	706	726	564	95
24	424	456	513	651	790	839	887	656	121
25	469	508	578	751	918	982	1,060	754	152
26	516	562	645	858	1,060	1,139	1,247	860	186
27	569	624	717	976	1,218	1,313	1,446	976	222
28	634	697	802	1,109	1,390	1,499	1,657	1,107	254
29	716	787	903	1,259	1,578	1,701	1,885	1,256	286
30	814	894	1,022	1,427	1,783	1,918	2,121	1,422	319
31	938	1,026	1,168	1,613	2,004	2,150	2,347	1,604	345
32	1,089	1,184	1,346	1,817	2,242	2,399	2,578	1,808	368
33	1,264	1,369	1,548	2,035	2,494	2,664	2,825	2,029	389
34	1,467	1,581	1,768	2,266	2,761	2,948	3,097	2,266	409
35	1,695	1,813	1,998	2,506	3,037	3,242	3,384	2,512	426
36	1,935	2,052	2,227	2,744	3,307	3,523	3,660	2,754	439
37	2,177	2,286	2,452	2,968	3,543	3,752	3,886	2,981	443
38	2,406	2,502	2,658	3,169	3,738	3,931	4,061	3,181	439
39	2,589	2,680	2,825	3,334	3,895	4,076	4,202	3,350	434
40	2,722	2,814	2,955	3,470	4,034	4,212	4,331	3,486	434
41	2,809	2,906	3,051	3,576	4,154	4,330	4,444	3,588	439
42	2,849	2,954	3,114	3,655	4,251	4,423	4,554	3,656	448
43	2,862	2,975	3,159	3,717	4,333	4,495	4,685	3,693	459

Source of Information:

Michael S. Kramer et al. A New and Improved Population-based Canadian Reference for Birth Weight for Gestational Age. Pediatrics, electronic version, August, 2001. http://www.pediatrics.org/cgi/content/full/108/2/e35

Birth Weight for Gestational Age - Poster

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