Based on the 2009 Institute of Medicine guidelines — the same numbers your OB uses. We'll show you the recommended range, where you are now, and how it tracks week by week.
Right where you should be. To finish in range, aim for about 0.8–1.4 lb per week for the next 20 weeks.
These are population-level guidelines from the IOM, not a verdict on your body. Some people gain mostly in the second trimester; some catch up in the third. Twins, gestational diabetes, hyperemesis, and individual metabolism all shift the picture. The most useful thing you can do with this number is bring it to your OB — they have the rest of the context.