Found this in Tri 3 and thought it was interesting so stole it
Baby: 7-8 pounds
Placenta: 1-2 pounds
Amniotic fluid: 2 pounds
Uterus: 2 pounds
Maternal breast tissue: 2 pounds
Maternal blood : 4 pounds
Fluids in maternal tissue: 4 pounds
Maternal fat and nutrient stores: 7 pounds
How much total weight should I gain?
The amount of weight you should gain depends on your weight before pregnancy. You should gain:
25-37 pounds if you were a healthy weight before pregnancy.
28-40 pounds if you were underweight before pregnancy.
15-25 pounds if you were overweight before pregnancy.
At what rate should I gain weight during my pregnancy?
How much you should gain depends on your weight before you were pregnant and how far along you are in your pregnancy.
Healthy weight before pregnancy:
3-5 pounds during the first trimester
Approximately 1-2 pounds per week in the second trimester
Approximately 1-2 pounds per week in the third trimester
Underweight before pregnancy:
5-6 pounds or more in your first trimester; this also can depend on how underweight you were before pregnancy & your health care provider's recommendations
1-2 pounds per week in the second and third trimesters
Overweight before pregnancy:
Approximately 1-2 pounds in the first trimester
Approximately 1 pound per week during the last six months

Baby: 7-8 pounds
Placenta: 1-2 pounds
Amniotic fluid: 2 pounds
Uterus: 2 pounds
Maternal breast tissue: 2 pounds
Maternal blood : 4 pounds
Fluids in maternal tissue: 4 pounds
Maternal fat and nutrient stores: 7 pounds
How much total weight should I gain?
The amount of weight you should gain depends on your weight before pregnancy. You should gain:
25-37 pounds if you were a healthy weight before pregnancy.
28-40 pounds if you were underweight before pregnancy.
15-25 pounds if you were overweight before pregnancy.
At what rate should I gain weight during my pregnancy?
How much you should gain depends on your weight before you were pregnant and how far along you are in your pregnancy.
Healthy weight before pregnancy:
3-5 pounds during the first trimester
Approximately 1-2 pounds per week in the second trimester
Approximately 1-2 pounds per week in the third trimester
Underweight before pregnancy:
5-6 pounds or more in your first trimester; this also can depend on how underweight you were before pregnancy & your health care provider's recommendations
1-2 pounds per week in the second and third trimesters
Overweight before pregnancy:
Approximately 1-2 pounds in the first trimester
Approximately 1 pound per week during the last six months