Percent of Singleton Births by Mother's BMI at Start of Pregnancy,
and Maternal Weight Gain by Percent of Mother's BMI Classification¹,
By Race and Hispanic or Middle Easterner Ancestry,
Michigan Residents, 2023

Total Singleton Live Births

Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Maternal Weight Gain Grouped by IOM Guidelines³			Maternal Weight Gain as Percent of BMI Classification
Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Below	Recom-mended	Above	Below	Recom- mended	Above
<18.5 Underweight	2,592	2.8	846	970	758	32.6	37.4	29.2
18.5 - 24.9 Desirable	35,491	37.9	9,307	11,914	13,949	26.2	33.6	39.3
25.0 - 29.9 Overweight	24,768	26.4	3,485	6,192	14,908	14.1	25.0	60.2
>30.0 Obese	30,803	32.9	6,527	7,254	16,834	21.2	23.5	54.7

Total	93,654	100.0	20,165	26,330	46,449	21.5	28.1	49.6

White Singleton Live Births

Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Maternal Weight Gain Grouped by IOM Guidelines³			Maternal Weight Gain as Percent of BMI Classification
Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Below	Recom-mended	Above	Below	Recom- mended	Above
<18.5 Underweight	1,807	2.6	540	703	551	29.9	38.9	30.5
18.5 - 24.9 Desirable	27,152	39.3	6,450	9,395	11,058	23.8	34.6	40.7
25.0 - 29.9 Overweight	18,391	26.6	2,218	4,461	11,587	12.1	24.3	63.0
>30.0 Obese	21,679	31.4	4,356	5,072	12,121	20.1	23.4	55.9

Total	69,029	100.0	13,564	19,631	35,317	19.6	28.4	51.2

Black Singleton Live Births

Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Maternal Weight Gain Grouped by IOM Guidelines³			Maternal Weight Gain as Percent of BMI Classification
Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Below	Recom-mended	Above	Below	Recom- mended	Above
<18.5 Underweight	487	3.0	202	158	126	41.5	32.4	25.9
18.5 - 24.9 Desirable	4,851	29.4	1,663	1,319	1,831	34.3	27.2	37.7
25.0 - 29.9 Overweight	4,049	24.5	786	1,020	2,208	19.4	25.2	54.5
>30.0 Obese	7,109	43.1	1,692	1,690	3,682	23.8	23.8	51.8

Total	16,496	100.0	4,343	4,187	7,847	26.3	25.4	47.6

Asian & Pacific Islander Singleton Live Births

Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Maternal Weight Gain Grouped by IOM Guidelines³			Maternal Weight Gain as Percent of BMI Classification
Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Below	Recom-mended	Above	Below	Recom- mended	Above
<18.5 Underweight	184	4.4	71	78	35	38.6	42.4	19.0
18.5 - 24.9 Desirable	2,164	51.8	743	785	617	34.3	36.3	28.5
25.0 - 29.9 Overweight	1,243	29.7	263	402	564	21.2	32.3	45.4
>30.0 Obese	590	14.1	139	129	316	23.6	21.9	53.6

Total	4,181	100.0	1,216	1,394	1,532	29.1	33.3	36.6

Native American Singleton Live Births

Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Maternal Weight Gain Grouped by IOM Guidelines³			Maternal Weight Gain as Percent of BMI Classification
Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Below	Recom-mended	Above	Below	Recom- mended	Above
<18.5 Underweight	28	2.9	3	5	18	*	*	64.3
18.5 - 24.9 Desirable	304	31.7	73	86	142	24.0	28.3	46.7
25.0 - 29.9 Overweight	218	22.7	23	51	143	10.6	23.4	65.6
>30.0 Obese	409	42.6	90	81	236	22.0	19.8	57.7

Total	959	100.0	189	223	539	19.7	23.3	56.2

Hispanic Singleton Live Births

Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Maternal Weight Gain Grouped by IOM Guidelines³			Maternal Weight Gain as Percent of BMI Classification
Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Below	Recom-mended	Above	Below	Recom- mended	Above
<18.5 Underweight	176	2.5	51	57	65	29.0	32.4	36.9
18.5 - 24.9 Desirable	2,260	31.7	756	710	778	33.5	31.4	34.4
25.0 - 29.9 Overweight	2,024	28.4	377	615	1,019	18.6	30.4	50.3
>30.0 Obese	2,668	37.4	581	647	1,423	21.8	24.3	53.3

Total	7,128	100.0	1,765	2,029	3,285	24.8	28.5	46.1

Middle Easterner Singleton Live Births

Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Maternal Weight Gain Grouped by IOM Guidelines³			Maternal Weight Gain as Percent of BMI Classification
Initial Body Mass Index (BMI) and (IOM Classification)	Singleton Births²	Percent of Singleton Births	Below	Recom-mended	Above	Below	Recom- mended	Above
<18.5 Underweight	140	2.8	57	43	22	40.7	30.7	15.7
18.5 - 24.9 Desirable	2,190	43.5	605	612	652	27.6	27.9	29.8
25.0 - 29.9 Overweight	1,546	30.7	282	391	690	18.2	25.3	44.6
>30.0 Obese	1,164	23.1	220	232	524	18.9	19.9	45.0

Total	5,040	100.0	1,164	1,278	1,888	23.1	25.4	37.5

Notes:

¹This table uses BMI categories defined by the World Health Organization (1995), and recommended for application to weight gain tables by the IOM in 2009.

²Numbers are counts of singleton live births with reported pre-pregnancy BMI. Other counts are for mothers of singleton live births, with known BMI and weight gain figures.

³The Institute of Medicine (IOM) defines recommended weight gain during pregnancy according to the following table:

Institute of Medicine (IOM) Pre-pregnancy BMI Classification &
Recommended Total Weight Gain During Pregnancy
BMI Classification	Weight Gain
BMI Classification	Pounds	Kilograms
Underweight	28-40	12.5-18
Desirable	25-35	11.5-16
Overweight	15-25	7.0-11.5
Obese	11-20	5-9

Source:

2023 Michigan Resident Birth Files, Division for Vital Records & Health Statistics, Michigan Department of Health & Human Services.

Percent of Singleton Births by Mother's BMI at Start of Pregnancy, and Maternal Weight Gain by Percent of Mother's BMI Classification1, By Race and Hispanic or Middle Easterner Ancestry, Michigan Residents, 2023