Relative Weight Classification

Prepregnant BMI

Underweight

<19.8

Normal

19.8-26.0

Overweight

26.1-29.0

Obese

>29.0

Weight Gain During Pregnancy

Plot the pregnant woman's weight on the weight gain chart using one of the following methods. Use a colored pen to highlight the dashed line that corresponds to the woman's BMI category.

When prepregnancy weight is known: (1) write the woman's prepregnancy weight, rounded to the nearest pound, on the blank line to the left of the zero on the left-hand side of the grid; then mark an x at 0 gain for 0 weeks; (2) fill in the rest of the blanks along the left side of the grid, adding the prepregnancy weight to the weight gain shown at each horizontal line (for example, if the woman's prepregnancy weight was 121 lb, 126 lb is the prepregnancy weight plus a 5-lb gain, 131 lb is the prepregnancy weight plus a 10-lb gain, and so on); (3) at each subsequent visit, have the woman plot her current weight at the point corresponding to the number of weeks of gestation.

If prepregnancy weight is not known: (1) mark an x on the highlighted dashed line at the point that corresponds to the correct number of weeks of gestation; (2) move horizontally from that point to find the corresponding point on the vertical axis, which shows weight, and write the woman's current weight to the left of that point; (3) if the woman's initial weight does not fall on a horizontal line, estimate the number to write in the blank at the nearest horizontal line (add or subtract up to 2 lb); then fill in the rest of the blanks up the left side of the grid by adding 5 lb for each horizontal line.



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