When woman get pregnant they are supposed to gain weight. Not gaining enough weight can cause problems just as gaining too much weight can cause problems. But when you are 4 months pregnant or when you are 7 months pregnant it is hard to know how much you should weigh at that point in your pregnancy. I made a spreadsheet to help my wife know at any point of her pregnancy whether she is underweight or overweight relative to the end target.
The spreadsheets are available below in Excel and OpenOffice format. I assumed a weight gain of 4-6 lbs in the first trimester followed by steady weight gain all the way until the end of the pregnancy. The defaults are a minimum gain of 25 lbs, a target gain of 27.5 lbs, and a maximum gain of 30 lbs. The minimum and maximum bands are visible on the chart and the goal is to stay within those bands. You only need to enter your starting weight, your date of last menstruation and the low, medium, and high targets on the "Input" sheet and enter your weight weekly (you can skip weeks too and it will still work) on the "Graph" sheet. The defaults are for someone with average BMI.
Supposedly in the U.S., woman with normal BMIs are advised to gain 25-35 lbs whereas in Canada they are advised to gain 25-30 lbs (see "CBC: Pregnancy weight gain guidelines may be too high"). If you have a high BMI you should gain a less weight and if you have a low BMI you should gain a bit more. There are lots of other websites or books with more information on this.
Update: Check out this update from Todd: http://www.epiphanyofthefox.com/private/new_pregnancy_weight_gain.xlsm.
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