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Recommended Weight Gain During Pregnancy for
Singleton and Twin Pregnancies


Guidelines for pregnancy weight gain ,
issued by the  Institute of Medicine (IOM) are based on a woman's BMI (body mass index) before becoming pregnant (prepregnancy) [2].


The body mass index (BMI) is a measure of someone's weight in relation to their height. The BMI is equal to a person's weight divided by their height .
It is calculated either as:
 


BMI =
(Weight in pounds /  Height in inches 2 ) x 703
 
     OR

BMI = (Weight in kilograms  / Height in meters 2)

The greater a person's weight is for a given height the higher their BMI will be. The National Institutes of Health (NIH) provides a BMI calculator at http://www.nhlbisupport.com/bmi/ and a table at http://www.nhlbi.nih.gov/guidelines/obesity/bmi_tbl.htm. The BMI is used to screen persons for weight categories that may lead to health problems [1].

Normal BMI (18.5 - 24.9)
Height  (feet,inches) weight
(pounds)
4' 10" 91 - 119
4' 11" 94- 124
5' 0" 97-128
5' 1" 100-132
5' 2" 104-136
5' 3" 107-141
5' 4" 110-145
5' 5" 114-150
5' 6" 118-155
5' 7" 121-159
5' 8" 125-164
5' 9" 128-169
5' 10" 132-174
5' 11" 136-179
6' 0" 140-184
6' 1" 144-189
6' 2" 148-194
6' 3" 152-200
6' 4" 156-205
Prepregnancy BMI Category Recommended Gestational Weight
Gain Singleton
Recommended Gestational Weight
Gain
Twins
= <18.5 Underweight 12.5 - 18 kg
28 - 40 pounds
 
= 18.5-24.9 Normal weight 11.5 - 16  kg
25 - 35  pounds
17 - 25 kg
37 - 54 pounds
= 25-29.9 Overweight 7 - 11.5 kg
15 - 25 pounds
 
14 - 23 kg
31 - 50 pounds
30 -34.9 Obese- Class I 5 - 9 kg
11 - 20 pounds
11 - 19 kg
25 - 42 pounds
35 - 39.9 Obese- Class II    
40 and above Obese- Class III    

SEE ALSO: http://www.perinatology.com/calculators/BMI.htm

1  U.S. Preventive Services Task Force.Screening for obesity in adults: recommendations and rationale. Ann Intern Med. 2003 Dec 2;139(11):930-2.PMID:14644896
2.  Rasmussen KM ed et al. Weight Gain During Pregnancy: Reexamining the Guidelines Institute of Medicine; National Research Council 2009. p 252, 254
http://www.nap.edu/catalog/12584.html

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