Weight Gain During Pregnancy: Reexamining the Guidelines

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Weight Gain During Pregnancy: Reexamining the Guidelines (2009)
Food and Nutrition Board (FNB)
Board on Children, Youth and Families (BOCYF)

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. "Appendix C: Supplementary Information on Composition and Components of Gestational Weight Gain." Weight Gain During Pregnancy: Reexamining the Guidelines. Washington, DC: The National Academies Press, 2009.

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Weight Gain During Pregnancy: Reexaming the Guidelines

TABLE C-5 Mean Weights and Percentiles for Placentas (singletons, twins, and triplets)

Gestational age (weeks)	90th Percentile			Mean Placental Weight			10th Percentile			Cases (n)
Gestational age (weeks)	Singletons	Twins	Triplets	Singletons	Twins	Triplets	Singletons	Twins	Triplets	Singletons	Twins	Triplets
19	—	263	—	—	212	—	—	161	—	—	2	—
20	—	270	285	—	218	253	—	166	226	—	3	3
21	172	286	320	143	231	284	114	176	257	3	2	2
22	191	310	345	157	251	319	122	191	289	6	5	2
23	211	343	400	172	276	361	133	210	331	7	2	3
24	233	382	445	189	307	406	145	232	371	9	3	5
25	256	426	498	208	341	456	159	257	408	19	5	6
26	280	475	558	227	380	509	175	284	444	14	4	6
27	305	528	630	248	421	564	192	314	480	9	8	4
28	331	584	697	270	464	621	210	345	516	16	7	5
29	357	641	772	293	509	679	229	377	553	11	12	6
30	384	700	849	316	554	738	249	409	591	12	17	10
31	411	758	925	340	600	797	269	441	631	14	13	15
32	438	815	1,000	364	644	855	290	472	674	24	29	7
33	464	870	1,072	387	687	911	311	503	719	30	27	14
34	491	923	1,139	411	727	965	331	531	768	32	53	43
35	516	971	1,200	434	764	1,017	352	558	821	44	52	33
36	542	1,014	1,253	457	798	1,065	372	582	878	36	66	19
37	566	1,051	1,297	478	827	1,108	391	602	940	32	58	8
38	589	1,082	1,330	499	850	1,147	409	619	1,007	62	54	5
39	611	1,105	—	519	868	—	426	631	—	103	38	—
40	632	1,118	—	537	879	—	442	639	—	193	47	—
41	651	1,123	—	553	882	—	456	642	—	8 7	1 2	—
SOURCES: Pediatric Pathology & Laboratory Medicine by Pinar H., C. J. Sung, C. E. Oyer and D. B. Singer. Copyright 1996 by Informa Clinical Medicine—Journals. Reproduced with permission of Informa Clinical Medicine—Journals via Copyright Clearance Center; Reprinted from Pinar H., M. Stephens, D. B. Singer, T. K. Boyd, S. M. Pflueger, D. L. Gang, D. J. Roberts and C. J. Sung. 2002. Triplet placentas: reference values for weights. Pediatric and Developmental Pathology 5(5): 495-498 with kind permission from Springer Science and Business Media.