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, 2024

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	2,575	2.8	785	1,005	753	30.5	39.0	29.2
18.5 - 24.9 Desirable	35,416	37.9	8,749	11,513	14,783	24.7	32.5	41.7
25.0 - 29.9 Overweight	24,786	26.6	3,126	5,997	15,443	12.6	24.2	62.3
>30.0 Obese	30,570	32.7	6,092	6,803	17,492	19.9	22.3	57.2

Total	93,347	100.0	18,752	25,318	48,471	20.1	27.1	51.9

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	1,694	2.6	453	679	539	26.7	40.1	31.8
18.5 - 24.9 Desirable	25,975	39.2	5,608	8,594	11,477	21.6	33.1	44.2
25.0 - 29.9 Overweight	17,496	26.4	1,827	4,037	11,472	10.4	23.1	65.6
>30.0 Obese	21,167	31.9	3,966	4,632	12,442	18.7	21.9	58.8

Total	66,332	100.0	11,854	17,942	35,930	17.9	27.0	54.2

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	455	3.2	182	159	112	40.0	34.9	24.6
18.5 - 24.9 Desirable	4,137	29.2	1,363	1,131	1,615	32.9	27.3	39.0
25.0 - 29.9 Overweight	3,556	25.1	606	900	2,025	17.0	25.3	56.9
>30.0 Obese	6,040	42.6	1,398	1,380	3,235	23.1	22.8	53.6

Total	14,188	100.0	3,549	3,570	6,987	25.0	25.2	49.2

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	160	4.0	56	79	23	35.0	49.4	14.4
18.5 - 24.9 Desirable	2,075	52.3	706	785	574	34.0	37.8	27.7
25.0 - 29.9 Overweight	1,117	28.2	198	333	576	17.7	29.8	51.6
>30.0 Obese	612	15.4	129	157	323	21.1	25.7	52.8

Total	3,964	100.0	1,089	1,354	1,496	27.5	34.2	37.7

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	16	2.1	7	6	3	43.8	37.5	*
18.5 - 24.9 Desirable	272	36.0	61	71	136	22.4	26.1	50.0
25.0 - 29.9 Overweight	160	21.2	20	30	109	12.5	18.8	68.1
>30.0 Obese	308	40.7	74	54	180	24.0	17.5	58.4

Total	756	100.0	162	161	428	21.4	21.3	56.6

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	140	2.5	44	50	45	31.4	35.7	32.1
18.5 - 24.9 Desirable	1,713	30.9	560	511	622	32.7	29.8	36.3
25.0 - 29.9 Overweight	1,549	28.0	276	450	808	17.8	29.1	52.2
>30.0 Obese	2,139	38.6	459	540	1,127	21.5	25.2	52.7

Total	5,541	100.0	1,339	1,551	2,602	24.2	28.0	47.0

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	150	2.8	50	43	25	33.3	28.7	16.7
18.5 - 24.9 Desirable	2,292	43.3	656	584	681	28.6	25.5	29.7
25.0 - 29.9 Overweight	1,659	31.3	339	385	715	20.4	23.2	43.1
>30.0 Obese	1,193	22.5	259	230	521	21.7	19.3	43.7

Total	5,294	100.0	1,304	1,242	1,942	24.6	23.5	36.7

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:

2024 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, 2024