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, 2020

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
Below Recom-mended Above Below Recom-
mended
Above
<18.5
 Underweight
2,7792.81,0241,08066636.838.924.0
18.5 - 24.9
Desirable
38,75539.110,32713,77914,55426.635.637.6
25.0 - 29.9
Overweight
26,10626.33,3826,85915,81413.026.360.6
>30.0
Obese
31,48631.86,5867,54017,28520.923.954.9
Total 99,126100.021,31929,25848,31921.529.548.7

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
Below Recom-mended Above Below Recom-
mended
Above
<18.5
 Underweight
1,9112.764877748233.940.725.2
18.5 - 24.9
Desirable
29,02940.76,98210,71311,28424.136.938.9
25.0 - 29.9
Overweight
18,87326.52,1234,78911,93211.225.463.2
>30.0
Obese
21,51430.24,3295,11612,02620.123.855.9
Total 71,327100.014,08221,39535,72419.730.050.1
 

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
Below Recom-mended Above Below Recom-
mended
Above
<18.5
 Underweight
5482.823118113242.233.024.1
18.5 - 24.9
Desirable
5,88030.41,9261,7092,21332.829.137.6
25.0 - 29.9
Overweight
4,87325.28181,2492,78716.825.657.2
>30.0
Obese
8,01341.51,8231,8764,28622.823.453.5
Total 19,314100.04,7985,0159,41824.826.048.8

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
Below Recom-mended Above Below Recom-
mended
Above
<18.5
 Underweight
2275.3105883346.338.814.5
18.5 - 24.9
Desirable
2,38255.291486160138.436.125.2
25.0 - 29.9
Overweight
1,15326.721641751918.736.245.0
>30.0
Obese
55612.910516927918.930.450.2
Total 4,318100.01,3401,5351,43231.035.533.2
 

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
Below Recom-mended Above Below Recom-
mended
Above
<18.5
 Underweight
232.779730.439.130.4
18.5 - 24.9
Desirable
29034.6669412922.832.444.5
25.0 - 29.9
Overweight
19823.6284912114.124.761.1
>30.0
Obese
32739.0826817725.120.854.1
Total 838100.018322043421.826.351.8
 

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
Below Recom-mended Above Below Recom-
mended
Above
<18.5
 Underweight
1402.058512941.436.420.7
18.5 - 24.9
Desirable
2,23832.474474374433.233.233.2
25.0 - 29.9
Overweight
1,97028.63196381,01116.232.451.3
>30.0
Obese
2,55237.05717161,26222.428.149.5
Total 6,900100.01,6922,1483,04624.531.144.1

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
Below Recom-mended Above Below Recom-
mended
Above
<18.5
 Underweight
1593.562553339.034.620.8
18.5 - 24.9
Desirable
1,99344.460664664630.432.432.4
25.0 - 29.9
Overweight
1,32629.519740767114.930.750.6
>30.0
Obese
1,01422.617925051017.724.750.3
Total 4,492100.01,0441,3581,86023.230.241.4

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
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:

2020 Michigan Resident Birth Files, Division for Vital Records & Health Statistics, Michigan Department of Health & Human Services.